platformsupport/input: add xkbcommon utilities lib

xcb/eglfs/wayland - all use XKB keyboard configs and APIs. There
is a lot of duplicated and naturally a diverging code. This patch
adds a helper library to avoid all the mentioned problems and unify
feature set between these platforms.

qlibinputkeyboard:

Added a fixup for 2803cdf758dbae1006a0c50300af12dac9f71531. From
spec: "keysyms, when bound to modifiers, affect the rules [..]",
meaning we can't look at keys in isolation, but have to check if
bounding exists in the keymap. This is done by using
xkb_state_mod_name_is_active() API, but that API has its limitations -
https://github.com/xkbcommon/libxkbcommon/issues/88
I will fix this separately in the LTS (5.12) branch.

We need to read the modifier state before the key action. This
patch fixes a regression introduced by aforementioned patch, which
caused modifiers being reported wrongly in QKeyEvent::modifiers().

qtwayland:

Moved toKeysym(QKeyEvent) from qtwayland repository into this library.
For this and other key mapping functionality wayland was duplicating
the key table. All of that will be removed from qtwayland, and calls
will be replaced to use this lib. Adjusted toKeysym() to fix QTBUG-71301.
Qt keys don't map to ASCII codes, so first we need search in our key
table, instead of mapping from unicode.

lookupStringNoKeysymTransformations():

fixed off-by-one error, where we were including terminating NUL in
QString.

Fixes: QTBUG-71301
Task-number: QTBUG-65503
Change-Id: Idfddea5b34ad620235dc08c0b9e5a0669111821a
Reviewed-by: Johan Helsing <johan.helsing@qt.io>

4 files changed, 1157 insertions, 0 deletions

diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon.cpp b/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
new file mode 100644
index 0000000000..4bee868fa9
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
@@ -0,0 +1,797 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qxkbcommon_p.h"
+
+#include <private/qmakearray_p.h>
+
+#include <QtGui/QKeyEvent>
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(lcXkbcommon, "qt.xkbcommon")
+
+static int keysymToQtKey_internal(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                                  xkb_state *state, xkb_keycode_t code,
+                                  bool superAsMeta, bool hyperAsMeta);
+
+typedef struct xkb2qt
+{
+    unsigned int xkb;
+    unsigned int qt;
+
+    constexpr bool operator <=(const xkb2qt &that) const noexcept
+    {
+        return xkb <= that.xkb;
+    }
+
+    constexpr bool operator <(const xkb2qt &that) const noexcept
+    {
+        return xkb < that.xkb;
+    }
+} xkb2qt_t;
+
+template<std::size_t Xkb, std::size_t Qt>
+struct Xkb2Qt
+{
+    using Type = xkb2qt_t;
+    static constexpr Type data() noexcept { return Type{Xkb, Qt}; }
+};
+
+static constexpr const auto KeyTbl = qMakeArray(
+    QSortedData<
+        // misc keys
+
+        Xkb2Qt<XKB_KEY_Escape,                  Qt::Key_Escape>,
+        Xkb2Qt<XKB_KEY_Tab,                     Qt::Key_Tab>,
+        Xkb2Qt<XKB_KEY_ISO_Left_Tab,            Qt::Key_Backtab>,
+        Xkb2Qt<XKB_KEY_BackSpace,               Qt::Key_Backspace>,
+        Xkb2Qt<XKB_KEY_Return,                  Qt::Key_Return>,
+        Xkb2Qt<XKB_KEY_Insert,                  Qt::Key_Insert>,
+        Xkb2Qt<XKB_KEY_Delete,                  Qt::Key_Delete>,
+        Xkb2Qt<XKB_KEY_Clear,                   Qt::Key_Delete>,
+        Xkb2Qt<XKB_KEY_Pause,                   Qt::Key_Pause>,
+        Xkb2Qt<XKB_KEY_Print,                   Qt::Key_Print>,
+        Xkb2Qt<0x1005FF60,                      Qt::Key_SysReq>,         // hardcoded Sun SysReq
+        Xkb2Qt<0x1007ff00,                      Qt::Key_SysReq>,         // hardcoded X386 SysReq
+
+        // cursor movement
+
+        Xkb2Qt<XKB_KEY_Home,                    Qt::Key_Home>,
+        Xkb2Qt<XKB_KEY_End,                     Qt::Key_End>,
+        Xkb2Qt<XKB_KEY_Left,                    Qt::Key_Left>,
+        Xkb2Qt<XKB_KEY_Up,                      Qt::Key_Up>,
+        Xkb2Qt<XKB_KEY_Right,                   Qt::Key_Right>,
+        Xkb2Qt<XKB_KEY_Down,                    Qt::Key_Down>,
+        Xkb2Qt<XKB_KEY_Prior,                   Qt::Key_PageUp>,
+        Xkb2Qt<XKB_KEY_Next,                    Qt::Key_PageDown>,
+
+        // modifiers
+
+        Xkb2Qt<XKB_KEY_Shift_L,                 Qt::Key_Shift>,
+        Xkb2Qt<XKB_KEY_Shift_R,                 Qt::Key_Shift>,
+        Xkb2Qt<XKB_KEY_Shift_Lock,              Qt::Key_Shift>,
+        Xkb2Qt<XKB_KEY_Control_L,               Qt::Key_Control>,
+        Xkb2Qt<XKB_KEY_Control_R,               Qt::Key_Control>,
+        Xkb2Qt<XKB_KEY_Meta_L,                  Qt::Key_Meta>,
+        Xkb2Qt<XKB_KEY_Meta_R,                  Qt::Key_Meta>,
+        Xkb2Qt<XKB_KEY_Alt_L,                   Qt::Key_Alt>,
+        Xkb2Qt<XKB_KEY_Alt_R,                   Qt::Key_Alt>,
+        Xkb2Qt<XKB_KEY_Caps_Lock,               Qt::Key_CapsLock>,
+        Xkb2Qt<XKB_KEY_Num_Lock,                Qt::Key_NumLock>,
+        Xkb2Qt<XKB_KEY_Scroll_Lock,             Qt::Key_ScrollLock>,
+        Xkb2Qt<XKB_KEY_Super_L,                 Qt::Key_Super_L>,
+        Xkb2Qt<XKB_KEY_Super_R,                 Qt::Key_Super_R>,
+        Xkb2Qt<XKB_KEY_Menu,                    Qt::Key_Menu>,
+        Xkb2Qt<XKB_KEY_Hyper_L,                 Qt::Key_Hyper_L>,
+        Xkb2Qt<XKB_KEY_Hyper_R,                 Qt::Key_Hyper_R>,
+        Xkb2Qt<XKB_KEY_Help,                    Qt::Key_Help>,
+        Xkb2Qt<0x1000FF74,                      Qt::Key_Backtab>,        // hardcoded HP backtab
+        Xkb2Qt<0x1005FF10,                      Qt::Key_F11>,            // hardcoded Sun F36 (labeled F11)
+        Xkb2Qt<0x1005FF11,                      Qt::Key_F12>,            // hardcoded Sun F37 (labeled F12)
+
+        // numeric and function keypad keys
+
+        Xkb2Qt<XKB_KEY_KP_Space,                Qt::Key_Space>,
+        Xkb2Qt<XKB_KEY_KP_Tab,                  Qt::Key_Tab>,
+        Xkb2Qt<XKB_KEY_KP_Enter,                Qt::Key_Enter>,
+        Xkb2Qt<XKB_KEY_KP_Home,                 Qt::Key_Home>,
+        Xkb2Qt<XKB_KEY_KP_Left,                 Qt::Key_Left>,
+        Xkb2Qt<XKB_KEY_KP_Up,                   Qt::Key_Up>,
+        Xkb2Qt<XKB_KEY_KP_Right,                Qt::Key_Right>,
+        Xkb2Qt<XKB_KEY_KP_Down,                 Qt::Key_Down>,
+        Xkb2Qt<XKB_KEY_KP_Prior,                Qt::Key_PageUp>,
+        Xkb2Qt<XKB_KEY_KP_Next,                 Qt::Key_PageDown>,
+        Xkb2Qt<XKB_KEY_KP_End,                  Qt::Key_End>,
+        Xkb2Qt<XKB_KEY_KP_Begin,                Qt::Key_Clear>,
+        Xkb2Qt<XKB_KEY_KP_Insert,               Qt::Key_Insert>,
+        Xkb2Qt<XKB_KEY_KP_Delete,               Qt::Key_Delete>,
+        Xkb2Qt<XKB_KEY_KP_Equal,                Qt::Key_Equal>,
+        Xkb2Qt<XKB_KEY_KP_Multiply,             Qt::Key_Asterisk>,
+        Xkb2Qt<XKB_KEY_KP_Add,                  Qt::Key_Plus>,
+        Xkb2Qt<XKB_KEY_KP_Separator,            Qt::Key_Comma>,
+        Xkb2Qt<XKB_KEY_KP_Subtract,             Qt::Key_Minus>,
+        Xkb2Qt<XKB_KEY_KP_Decimal,              Qt::Key_Period>,
+        Xkb2Qt<XKB_KEY_KP_Divide,               Qt::Key_Slash>,
+
+        // special non-XF86 function keys
+
+        Xkb2Qt<XKB_KEY_Undo,                    Qt::Key_Undo>,
+        Xkb2Qt<XKB_KEY_Redo,                    Qt::Key_Redo>,
+        Xkb2Qt<XKB_KEY_Find,                    Qt::Key_Find>,
+        Xkb2Qt<XKB_KEY_Cancel,                  Qt::Key_Cancel>,
+
+        // International input method support keys
+
+        // International & multi-key character composition
+        Xkb2Qt<XKB_KEY_ISO_Level3_Shift,        Qt::Key_AltGr>,
+        Xkb2Qt<XKB_KEY_Multi_key,               Qt::Key_Multi_key>,
+        Xkb2Qt<XKB_KEY_Codeinput,               Qt::Key_Codeinput>,
+        Xkb2Qt<XKB_KEY_SingleCandidate,         Qt::Key_SingleCandidate>,
+        Xkb2Qt<XKB_KEY_MultipleCandidate,       Qt::Key_MultipleCandidate>,
+        Xkb2Qt<XKB_KEY_PreviousCandidate,       Qt::Key_PreviousCandidate>,
+
+        // Misc Functions
+        Xkb2Qt<XKB_KEY_Mode_switch,             Qt::Key_Mode_switch>,
+        Xkb2Qt<XKB_KEY_script_switch,           Qt::Key_Mode_switch>,
+
+        // Japanese keyboard support
+        Xkb2Qt<XKB_KEY_Kanji,                   Qt::Key_Kanji>,
+        Xkb2Qt<XKB_KEY_Muhenkan,                Qt::Key_Muhenkan>,
+        //Xkb2Qt<XKB_KEY_Henkan_Mode,           Qt::Key_Henkan_Mode>,
+        Xkb2Qt<XKB_KEY_Henkan_Mode,             Qt::Key_Henkan>,
+        Xkb2Qt<XKB_KEY_Henkan,                  Qt::Key_Henkan>,
+        Xkb2Qt<XKB_KEY_Romaji,                  Qt::Key_Romaji>,
+        Xkb2Qt<XKB_KEY_Hiragana,                Qt::Key_Hiragana>,
+        Xkb2Qt<XKB_KEY_Katakana,                Qt::Key_Katakana>,
+        Xkb2Qt<XKB_KEY_Hiragana_Katakana,       Qt::Key_Hiragana_Katakana>,
+        Xkb2Qt<XKB_KEY_Zenkaku,                 Qt::Key_Zenkaku>,
+        Xkb2Qt<XKB_KEY_Hankaku,                 Qt::Key_Hankaku>,
+        Xkb2Qt<XKB_KEY_Zenkaku_Hankaku,         Qt::Key_Zenkaku_Hankaku>,
+        Xkb2Qt<XKB_KEY_Touroku,                 Qt::Key_Touroku>,
+        Xkb2Qt<XKB_KEY_Massyo,                  Qt::Key_Massyo>,
+        Xkb2Qt<XKB_KEY_Kana_Lock,               Qt::Key_Kana_Lock>,
+        Xkb2Qt<XKB_KEY_Kana_Shift,              Qt::Key_Kana_Shift>,
+        Xkb2Qt<XKB_KEY_Eisu_Shift,              Qt::Key_Eisu_Shift>,
+        Xkb2Qt<XKB_KEY_Eisu_toggle,             Qt::Key_Eisu_toggle>,
+        //Xkb2Qt<XKB_KEY_Kanji_Bangou,          Qt::Key_Kanji_Bangou>,
+        //Xkb2Qt<XKB_KEY_Zen_Koho,              Qt::Key_Zen_Koho>,
+        //Xkb2Qt<XKB_KEY_Mae_Koho,              Qt::Key_Mae_Koho>,
+        Xkb2Qt<XKB_KEY_Kanji_Bangou,            Qt::Key_Codeinput>,
+        Xkb2Qt<XKB_KEY_Zen_Koho,                Qt::Key_MultipleCandidate>,
+        Xkb2Qt<XKB_KEY_Mae_Koho,                Qt::Key_PreviousCandidate>,
+
+        // Korean keyboard support
+        Xkb2Qt<XKB_KEY_Hangul,                  Qt::Key_Hangul>,
+        Xkb2Qt<XKB_KEY_Hangul_Start,            Qt::Key_Hangul_Start>,
+        Xkb2Qt<XKB_KEY_Hangul_End,              Qt::Key_Hangul_End>,
+        Xkb2Qt<XKB_KEY_Hangul_Hanja,            Qt::Key_Hangul_Hanja>,
+        Xkb2Qt<XKB_KEY_Hangul_Jamo,             Qt::Key_Hangul_Jamo>,
+        Xkb2Qt<XKB_KEY_Hangul_Romaja,           Qt::Key_Hangul_Romaja>,
+        //Xkb2Qt<XKB_KEY_Hangul_Codeinput,      Qt::Key_Hangul_Codeinput>,
+        Xkb2Qt<XKB_KEY_Hangul_Codeinput,        Qt::Key_Codeinput>,
+        Xkb2Qt<XKB_KEY_Hangul_Jeonja,           Qt::Key_Hangul_Jeonja>,
+        Xkb2Qt<XKB_KEY_Hangul_Banja,            Qt::Key_Hangul_Banja>,
+        Xkb2Qt<XKB_KEY_Hangul_PreHanja,         Qt::Key_Hangul_PreHanja>,
+        Xkb2Qt<XKB_KEY_Hangul_PostHanja,        Qt::Key_Hangul_PostHanja>,
+        //Xkb2Qt<XKB_KEY_Hangul_SingleCandidate,Qt::Key_Hangul_SingleCandidate>,
+        //Xkb2Qt<XKB_KEY_Hangul_MultipleCandidate,Qt::Key_Hangul_MultipleCandidate>,
+        //Xkb2Qt<XKB_KEY_Hangul_PreviousCandidate,Qt::Key_Hangul_PreviousCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_SingleCandidate,  Qt::Key_SingleCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_MultipleCandidate,Qt::Key_MultipleCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_PreviousCandidate,Qt::Key_PreviousCandidate>,
+        Xkb2Qt<XKB_KEY_Hangul_Special,          Qt::Key_Hangul_Special>,
+        //Xkb2Qt<XKB_KEY_Hangul_switch,         Qt::Key_Hangul_switch>,
+        Xkb2Qt<XKB_KEY_Hangul_switch,           Qt::Key_Mode_switch>,
+
+        // dead keys
+        Xkb2Qt<XKB_KEY_dead_grave,              Qt::Key_Dead_Grave>,
+        Xkb2Qt<XKB_KEY_dead_acute,              Qt::Key_Dead_Acute>,
+        Xkb2Qt<XKB_KEY_dead_circumflex,         Qt::Key_Dead_Circumflex>,
+        Xkb2Qt<XKB_KEY_dead_tilde,              Qt::Key_Dead_Tilde>,
+        Xkb2Qt<XKB_KEY_dead_macron,             Qt::Key_Dead_Macron>,
+        Xkb2Qt<XKB_KEY_dead_breve,              Qt::Key_Dead_Breve>,
+        Xkb2Qt<XKB_KEY_dead_abovedot,           Qt::Key_Dead_Abovedot>,
+        Xkb2Qt<XKB_KEY_dead_diaeresis,          Qt::Key_Dead_Diaeresis>,
+        Xkb2Qt<XKB_KEY_dead_abovering,          Qt::Key_Dead_Abovering>,
+        Xkb2Qt<XKB_KEY_dead_doubleacute,        Qt::Key_Dead_Doubleacute>,
+        Xkb2Qt<XKB_KEY_dead_caron,              Qt::Key_Dead_Caron>,
+        Xkb2Qt<XKB_KEY_dead_cedilla,            Qt::Key_Dead_Cedilla>,
+        Xkb2Qt<XKB_KEY_dead_ogonek,             Qt::Key_Dead_Ogonek>,
+        Xkb2Qt<XKB_KEY_dead_iota,               Qt::Key_Dead_Iota>,
+        Xkb2Qt<XKB_KEY_dead_voiced_sound,       Qt::Key_Dead_Voiced_Sound>,
+        Xkb2Qt<XKB_KEY_dead_semivoiced_sound,   Qt::Key_Dead_Semivoiced_Sound>,
+        Xkb2Qt<XKB_KEY_dead_belowdot,           Qt::Key_Dead_Belowdot>,
+        Xkb2Qt<XKB_KEY_dead_hook,               Qt::Key_Dead_Hook>,
+        Xkb2Qt<XKB_KEY_dead_horn,               Qt::Key_Dead_Horn>,
+        Xkb2Qt<XKB_KEY_dead_stroke,             Qt::Key_Dead_Stroke>,
+        Xkb2Qt<XKB_KEY_dead_abovecomma,         Qt::Key_Dead_Abovecomma>,
+        Xkb2Qt<XKB_KEY_dead_abovereversedcomma, Qt::Key_Dead_Abovereversedcomma>,
+        Xkb2Qt<XKB_KEY_dead_doublegrave,        Qt::Key_Dead_Doublegrave>,
+        Xkb2Qt<XKB_KEY_dead_belowring,          Qt::Key_Dead_Belowring>,
+        Xkb2Qt<XKB_KEY_dead_belowmacron,        Qt::Key_Dead_Belowmacron>,
+        Xkb2Qt<XKB_KEY_dead_belowcircumflex,    Qt::Key_Dead_Belowcircumflex>,
+        Xkb2Qt<XKB_KEY_dead_belowtilde,         Qt::Key_Dead_Belowtilde>,
+        Xkb2Qt<XKB_KEY_dead_belowbreve,         Qt::Key_Dead_Belowbreve>,
+        Xkb2Qt<XKB_KEY_dead_belowdiaeresis,     Qt::Key_Dead_Belowdiaeresis>,
+        Xkb2Qt<XKB_KEY_dead_invertedbreve,      Qt::Key_Dead_Invertedbreve>,
+        Xkb2Qt<XKB_KEY_dead_belowcomma,         Qt::Key_Dead_Belowcomma>,
+        Xkb2Qt<XKB_KEY_dead_currency,           Qt::Key_Dead_Currency>,
+        Xkb2Qt<XKB_KEY_dead_a,                  Qt::Key_Dead_a>,
+        Xkb2Qt<XKB_KEY_dead_A,                  Qt::Key_Dead_A>,
+        Xkb2Qt<XKB_KEY_dead_e,                  Qt::Key_Dead_e>,
+        Xkb2Qt<XKB_KEY_dead_E,                  Qt::Key_Dead_E>,
+        Xkb2Qt<XKB_KEY_dead_i,                  Qt::Key_Dead_i>,
+        Xkb2Qt<XKB_KEY_dead_I,                  Qt::Key_Dead_I>,
+        Xkb2Qt<XKB_KEY_dead_o,                  Qt::Key_Dead_o>,
+        Xkb2Qt<XKB_KEY_dead_O,                  Qt::Key_Dead_O>,
+        Xkb2Qt<XKB_KEY_dead_u,                  Qt::Key_Dead_u>,
+        Xkb2Qt<XKB_KEY_dead_U,                  Qt::Key_Dead_U>,
+        Xkb2Qt<XKB_KEY_dead_small_schwa,        Qt::Key_Dead_Small_Schwa>,
+        Xkb2Qt<XKB_KEY_dead_capital_schwa,      Qt::Key_Dead_Capital_Schwa>,
+        Xkb2Qt<XKB_KEY_dead_greek,              Qt::Key_Dead_Greek>,
+        Xkb2Qt<XKB_KEY_dead_lowline,            Qt::Key_Dead_Lowline>,
+        Xkb2Qt<XKB_KEY_dead_aboveverticalline,  Qt::Key_Dead_Aboveverticalline>,
+        Xkb2Qt<XKB_KEY_dead_belowverticalline,  Qt::Key_Dead_Belowverticalline>,
+        Xkb2Qt<XKB_KEY_dead_longsolidusoverlay, Qt::Key_Dead_Longsolidusoverlay>,
+
+        // Special keys from X.org - This include multimedia keys,
+        // wireless/bluetooth/uwb keys, special launcher keys, etc.
+        Xkb2Qt<XKB_KEY_XF86Back,                Qt::Key_Back>,
+        Xkb2Qt<XKB_KEY_XF86Forward,             Qt::Key_Forward>,
+        Xkb2Qt<XKB_KEY_XF86Stop,                Qt::Key_Stop>,
+        Xkb2Qt<XKB_KEY_XF86Refresh,             Qt::Key_Refresh>,
+        Xkb2Qt<XKB_KEY_XF86Favorites,           Qt::Key_Favorites>,
+        Xkb2Qt<XKB_KEY_XF86AudioMedia,          Qt::Key_LaunchMedia>,
+        Xkb2Qt<XKB_KEY_XF86OpenURL,             Qt::Key_OpenUrl>,
+        Xkb2Qt<XKB_KEY_XF86HomePage,            Qt::Key_HomePage>,
+        Xkb2Qt<XKB_KEY_XF86Search,              Qt::Key_Search>,
+        Xkb2Qt<XKB_KEY_XF86AudioLowerVolume,    Qt::Key_VolumeDown>,
+        Xkb2Qt<XKB_KEY_XF86AudioMute,           Qt::Key_VolumeMute>,
+        Xkb2Qt<XKB_KEY_XF86AudioRaiseVolume,    Qt::Key_VolumeUp>,
+        Xkb2Qt<XKB_KEY_XF86AudioPlay,           Qt::Key_MediaPlay>,
+        Xkb2Qt<XKB_KEY_XF86AudioStop,           Qt::Key_MediaStop>,
+        Xkb2Qt<XKB_KEY_XF86AudioPrev,           Qt::Key_MediaPrevious>,
+        Xkb2Qt<XKB_KEY_XF86AudioNext,           Qt::Key_MediaNext>,
+        Xkb2Qt<XKB_KEY_XF86AudioRecord,         Qt::Key_MediaRecord>,
+        Xkb2Qt<XKB_KEY_XF86AudioPause,          Qt::Key_MediaPause>,
+        Xkb2Qt<XKB_KEY_XF86Mail,                Qt::Key_LaunchMail>,
+        Xkb2Qt<XKB_KEY_XF86MyComputer,          Qt::Key_Launch0>,  // ### Qt 6: remap properly
+        Xkb2Qt<XKB_KEY_XF86Calculator,          Qt::Key_Launch1>,
+        Xkb2Qt<XKB_KEY_XF86Memo,                Qt::Key_Memo>,
+        Xkb2Qt<XKB_KEY_XF86ToDoList,            Qt::Key_ToDoList>,
+        Xkb2Qt<XKB_KEY_XF86Calendar,            Qt::Key_Calendar>,
+        Xkb2Qt<XKB_KEY_XF86PowerDown,           Qt::Key_PowerDown>,
+        Xkb2Qt<XKB_KEY_XF86ContrastAdjust,      Qt::Key_ContrastAdjust>,
+        Xkb2Qt<XKB_KEY_XF86Standby,             Qt::Key_Standby>,
+        Xkb2Qt<XKB_KEY_XF86MonBrightnessUp,     Qt::Key_MonBrightnessUp>,
+        Xkb2Qt<XKB_KEY_XF86MonBrightnessDown,   Qt::Key_MonBrightnessDown>,
+        Xkb2Qt<XKB_KEY_XF86KbdLightOnOff,       Qt::Key_KeyboardLightOnOff>,
+        Xkb2Qt<XKB_KEY_XF86KbdBrightnessUp,     Qt::Key_KeyboardBrightnessUp>,
+        Xkb2Qt<XKB_KEY_XF86KbdBrightnessDown,   Qt::Key_KeyboardBrightnessDown>,
+        Xkb2Qt<XKB_KEY_XF86PowerOff,            Qt::Key_PowerOff>,
+        Xkb2Qt<XKB_KEY_XF86WakeUp,              Qt::Key_WakeUp>,
+        Xkb2Qt<XKB_KEY_XF86Eject,               Qt::Key_Eject>,
+        Xkb2Qt<XKB_KEY_XF86ScreenSaver,         Qt::Key_ScreenSaver>,
+        Xkb2Qt<XKB_KEY_XF86WWW,                 Qt::Key_WWW>,
+        Xkb2Qt<XKB_KEY_XF86Sleep,               Qt::Key_Sleep>,
+        Xkb2Qt<XKB_KEY_XF86LightBulb,           Qt::Key_LightBulb>,
+        Xkb2Qt<XKB_KEY_XF86Shop,                Qt::Key_Shop>,
+        Xkb2Qt<XKB_KEY_XF86History,             Qt::Key_History>,
+        Xkb2Qt<XKB_KEY_XF86AddFavorite,         Qt::Key_AddFavorite>,
+        Xkb2Qt<XKB_KEY_XF86HotLinks,            Qt::Key_HotLinks>,
+        Xkb2Qt<XKB_KEY_XF86BrightnessAdjust,    Qt::Key_BrightnessAdjust>,
+        Xkb2Qt<XKB_KEY_XF86Finance,             Qt::Key_Finance>,
+        Xkb2Qt<XKB_KEY_XF86Community,           Qt::Key_Community>,
+        Xkb2Qt<XKB_KEY_XF86AudioRewind,         Qt::Key_AudioRewind>,
+        Xkb2Qt<XKB_KEY_XF86BackForward,         Qt::Key_BackForward>,
+        Xkb2Qt<XKB_KEY_XF86ApplicationLeft,     Qt::Key_ApplicationLeft>,
+        Xkb2Qt<XKB_KEY_XF86ApplicationRight,    Qt::Key_ApplicationRight>,
+        Xkb2Qt<XKB_KEY_XF86Book,                Qt::Key_Book>,
+        Xkb2Qt<XKB_KEY_XF86CD,                  Qt::Key_CD>,
+        Xkb2Qt<XKB_KEY_XF86Calculater,          Qt::Key_Calculator>,
+        Xkb2Qt<XKB_KEY_XF86Clear,               Qt::Key_Clear>,
+        Xkb2Qt<XKB_KEY_XF86ClearGrab,           Qt::Key_ClearGrab>,
+        Xkb2Qt<XKB_KEY_XF86Close,               Qt::Key_Close>,
+        Xkb2Qt<XKB_KEY_XF86Copy,                Qt::Key_Copy>,
+        Xkb2Qt<XKB_KEY_XF86Cut,                 Qt::Key_Cut>,
+        Xkb2Qt<XKB_KEY_XF86Display,             Qt::Key_Display>,
+        Xkb2Qt<XKB_KEY_XF86DOS,                 Qt::Key_DOS>,
+        Xkb2Qt<XKB_KEY_XF86Documents,           Qt::Key_Documents>,
+        Xkb2Qt<XKB_KEY_XF86Excel,               Qt::Key_Excel>,
+        Xkb2Qt<XKB_KEY_XF86Explorer,            Qt::Key_Explorer>,
+        Xkb2Qt<XKB_KEY_XF86Game,                Qt::Key_Game>,
+        Xkb2Qt<XKB_KEY_XF86Go,                  Qt::Key_Go>,
+        Xkb2Qt<XKB_KEY_XF86iTouch,              Qt::Key_iTouch>,
+        Xkb2Qt<XKB_KEY_XF86LogOff,              Qt::Key_LogOff>,
+        Xkb2Qt<XKB_KEY_XF86Market,              Qt::Key_Market>,
+        Xkb2Qt<XKB_KEY_XF86Meeting,             Qt::Key_Meeting>,
+        Xkb2Qt<XKB_KEY_XF86MenuKB,              Qt::Key_MenuKB>,
+        Xkb2Qt<XKB_KEY_XF86MenuPB,              Qt::Key_MenuPB>,
+        Xkb2Qt<XKB_KEY_XF86MySites,             Qt::Key_MySites>,
+        Xkb2Qt<XKB_KEY_XF86New,                 Qt::Key_New>,
+        Xkb2Qt<XKB_KEY_XF86News,                Qt::Key_News>,
+        Xkb2Qt<XKB_KEY_XF86OfficeHome,          Qt::Key_OfficeHome>,
+        Xkb2Qt<XKB_KEY_XF86Open,                Qt::Key_Open>,
+        Xkb2Qt<XKB_KEY_XF86Option,              Qt::Key_Option>,
+        Xkb2Qt<XKB_KEY_XF86Paste,               Qt::Key_Paste>,
+        Xkb2Qt<XKB_KEY_XF86Phone,               Qt::Key_Phone>,
+        Xkb2Qt<XKB_KEY_XF86Reply,               Qt::Key_Reply>,
+        Xkb2Qt<XKB_KEY_XF86Reload,              Qt::Key_Reload>,
+        Xkb2Qt<XKB_KEY_XF86RotateWindows,       Qt::Key_RotateWindows>,
+        Xkb2Qt<XKB_KEY_XF86RotationPB,          Qt::Key_RotationPB>,
+        Xkb2Qt<XKB_KEY_XF86RotationKB,          Qt::Key_RotationKB>,
+        Xkb2Qt<XKB_KEY_XF86Save,                Qt::Key_Save>,
+        Xkb2Qt<XKB_KEY_XF86Send,                Qt::Key_Send>,
+        Xkb2Qt<XKB_KEY_XF86Spell,               Qt::Key_Spell>,
+        Xkb2Qt<XKB_KEY_XF86SplitScreen,         Qt::Key_SplitScreen>,
+        Xkb2Qt<XKB_KEY_XF86Support,             Qt::Key_Support>,
+        Xkb2Qt<XKB_KEY_XF86TaskPane,            Qt::Key_TaskPane>,
+        Xkb2Qt<XKB_KEY_XF86Terminal,            Qt::Key_Terminal>,
+        Xkb2Qt<XKB_KEY_XF86Tools,               Qt::Key_Tools>,
+        Xkb2Qt<XKB_KEY_XF86Travel,              Qt::Key_Travel>,
+        Xkb2Qt<XKB_KEY_XF86Video,               Qt::Key_Video>,
+        Xkb2Qt<XKB_KEY_XF86Word,                Qt::Key_Word>,
+        Xkb2Qt<XKB_KEY_XF86Xfer,                Qt::Key_Xfer>,
+        Xkb2Qt<XKB_KEY_XF86ZoomIn,              Qt::Key_ZoomIn>,
+        Xkb2Qt<XKB_KEY_XF86ZoomOut,             Qt::Key_ZoomOut>,
+        Xkb2Qt<XKB_KEY_XF86Away,                Qt::Key_Away>,
+        Xkb2Qt<XKB_KEY_XF86Messenger,           Qt::Key_Messenger>,
+        Xkb2Qt<XKB_KEY_XF86WebCam,              Qt::Key_WebCam>,
+        Xkb2Qt<XKB_KEY_XF86MailForward,         Qt::Key_MailForward>,
+        Xkb2Qt<XKB_KEY_XF86Pictures,            Qt::Key_Pictures>,
+        Xkb2Qt<XKB_KEY_XF86Music,               Qt::Key_Music>,
+        Xkb2Qt<XKB_KEY_XF86Battery,             Qt::Key_Battery>,
+        Xkb2Qt<XKB_KEY_XF86Bluetooth,           Qt::Key_Bluetooth>,
+        Xkb2Qt<XKB_KEY_XF86WLAN,                Qt::Key_WLAN>,
+        Xkb2Qt<XKB_KEY_XF86UWB,                 Qt::Key_UWB>,
+        Xkb2Qt<XKB_KEY_XF86AudioForward,        Qt::Key_AudioForward>,
+        Xkb2Qt<XKB_KEY_XF86AudioRepeat,         Qt::Key_AudioRepeat>,
+        Xkb2Qt<XKB_KEY_XF86AudioRandomPlay,     Qt::Key_AudioRandomPlay>,
+        Xkb2Qt<XKB_KEY_XF86Subtitle,            Qt::Key_Subtitle>,
+        Xkb2Qt<XKB_KEY_XF86AudioCycleTrack,     Qt::Key_AudioCycleTrack>,
+        Xkb2Qt<XKB_KEY_XF86Time,                Qt::Key_Time>,
+        Xkb2Qt<XKB_KEY_XF86Select,              Qt::Key_Select>,
+        Xkb2Qt<XKB_KEY_XF86View,                Qt::Key_View>,
+        Xkb2Qt<XKB_KEY_XF86TopMenu,             Qt::Key_TopMenu>,
+        Xkb2Qt<XKB_KEY_XF86Red,                 Qt::Key_Red>,
+        Xkb2Qt<XKB_KEY_XF86Green,               Qt::Key_Green>,
+        Xkb2Qt<XKB_KEY_XF86Yellow,              Qt::Key_Yellow>,
+        Xkb2Qt<XKB_KEY_XF86Blue,                Qt::Key_Blue>,
+        Xkb2Qt<XKB_KEY_XF86Bluetooth,           Qt::Key_Bluetooth>,
+        Xkb2Qt<XKB_KEY_XF86Suspend,             Qt::Key_Suspend>,
+        Xkb2Qt<XKB_KEY_XF86Hibernate,           Qt::Key_Hibernate>,
+        Xkb2Qt<XKB_KEY_XF86TouchpadToggle,      Qt::Key_TouchpadToggle>,
+        Xkb2Qt<XKB_KEY_XF86TouchpadOn,          Qt::Key_TouchpadOn>,
+        Xkb2Qt<XKB_KEY_XF86TouchpadOff,         Qt::Key_TouchpadOff>,
+        Xkb2Qt<XKB_KEY_XF86AudioMicMute,        Qt::Key_MicMute>,
+        Xkb2Qt<XKB_KEY_XF86Launch0,             Qt::Key_Launch2>, // ### Qt 6: remap properly
+        Xkb2Qt<XKB_KEY_XF86Launch1,             Qt::Key_Launch3>,
+        Xkb2Qt<XKB_KEY_XF86Launch2,             Qt::Key_Launch4>,
+        Xkb2Qt<XKB_KEY_XF86Launch3,             Qt::Key_Launch5>,
+        Xkb2Qt<XKB_KEY_XF86Launch4,             Qt::Key_Launch6>,
+        Xkb2Qt<XKB_KEY_XF86Launch5,             Qt::Key_Launch7>,
+        Xkb2Qt<XKB_KEY_XF86Launch6,             Qt::Key_Launch8>,
+        Xkb2Qt<XKB_KEY_XF86Launch7,             Qt::Key_Launch9>,
+        Xkb2Qt<XKB_KEY_XF86Launch8,             Qt::Key_LaunchA>,
+        Xkb2Qt<XKB_KEY_XF86Launch9,             Qt::Key_LaunchB>,
+        Xkb2Qt<XKB_KEY_XF86LaunchA,             Qt::Key_LaunchC>,
+        Xkb2Qt<XKB_KEY_XF86LaunchB,             Qt::Key_LaunchD>,
+        Xkb2Qt<XKB_KEY_XF86LaunchC,             Qt::Key_LaunchE>,
+        Xkb2Qt<XKB_KEY_XF86LaunchD,             Qt::Key_LaunchF>,
+        Xkb2Qt<XKB_KEY_XF86LaunchE,             Qt::Key_LaunchG>,
+        Xkb2Qt<XKB_KEY_XF86LaunchF,             Qt::Key_LaunchH>
+    >::Data{}
+);
+
+xkb_keysym_t QXkbCommon::qxkbcommon_xkb_keysym_to_upper(xkb_keysym_t ks)
+{
+    xkb_keysym_t lower, upper;
+
+    xkbcommon_XConvertCase(ks, &lower, &upper);
+
+    return upper;
+}
+
+QString QXkbCommon::lookupString(struct xkb_state *state, xkb_keycode_t code)
+{
+    QVarLengthArray<char, 32> chars(32);
+    const int size = xkb_state_key_get_utf8(state, code, chars.data(), chars.size());
+    if (Q_UNLIKELY(size + 1 > chars.size())) { // +1 for NUL
+        chars.resize(size + 1);
+        xkb_state_key_get_utf8(state, code, chars.data(), chars.size());
+    }
+    return QString::fromUtf8(chars.constData(), size);
+}
+
+QString QXkbCommon::lookupStringNoKeysymTransformations(xkb_keysym_t keysym)
+{
+    QVarLengthArray<char, 32> chars(32);
+    const int size = xkb_keysym_to_utf8(keysym, chars.data(), chars.size());
+    if (size == 0)
+        return QString(); // the keysym does not have a Unicode representation
+
+    if (Q_UNLIKELY(size > chars.size())) {
+        chars.resize(size);
+        xkb_keysym_to_utf8(keysym, chars.data(), chars.size());
+    }
+    return QString::fromUtf8(chars.constData(), size - 1);
+}
+
+QVector<xkb_keysym_t> QXkbCommon::toKeysym(QKeyEvent *event)
+{
+    QVector<xkb_keysym_t> keysyms;
+    int qtKey = event->key();
+
+    if (qtKey >= Qt::Key_F1 && qtKey <= Qt::Key_F35) {
+        keysyms.append(XKB_KEY_F1 + (qtKey - Qt::Key_F1));
+    } else if (event->modifiers() & Qt::KeypadModifier) {
+        if (qtKey >= Qt::Key_0 && qtKey <= Qt::Key_9)
+            keysyms.append(XKB_KEY_KP_0 + (qtKey - Qt::Key_0));
+    } else if (isLatin(qtKey) && event->text().isUpper()) {
+        keysyms.append(qtKey);
+    }
+
+    if (!keysyms.isEmpty())
+        return keysyms;
+
+    // check if we have a direct mapping
+    auto it = std::find_if(KeyTbl.cbegin(), KeyTbl.cend(), [&qtKey](xkb2qt_t elem) {
+        return elem.qt == static_cast<uint>(qtKey);
+    });
+    if (it != KeyTbl.end()) {
+        keysyms.append(it->xkb);
+        return keysyms;
+    }
+
+    QVector<uint> ucs4;
+    if (event->text().isEmpty())
+        ucs4.append(qtKey);
+    else
+        ucs4 = event->text().toUcs4();
+
+    // From libxkbcommon keysym-utf.c:
+    // "We allow to represent any UCS character in the range U-00000000 to
+    // U-00FFFFFF by a keysym value in the range 0x01000000 to 0x01ffffff."
+    for (uint utf32 : qAsConst(ucs4))
+        keysyms.append(utf32 | 0x01000000);
+
+    return keysyms;
+}
+
+int QXkbCommon::keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers)
+{
+    return keysymToQtKey(keysym, modifiers, nullptr, 0);
+}
+
+int QXkbCommon::keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                              xkb_state *state, xkb_keycode_t code,
+                              bool superAsMeta, bool hyperAsMeta)
+{
+    // Note 1: All standard key sequences on linux (as defined in platform theme)
+    // that use a latin character also contain a control modifier, which is why
+    // checking for Qt::ControlModifier is sufficient here. It is possible to
+    // override QPlatformTheme::keyBindings() and provide custom sequences for
+    // QKeySequence::StandardKey. Custom sequences probably should respect this
+    // convention (alternatively, we could test against other modifiers here).
+    // Note 2: The possibleKeys() shorcut mechanism is not affected by this value
+    // adjustment and does its own thing.
+    if (modifiers & Qt::ControlModifier) {
+        // With standard shortcuts we should prefer a latin character, this is
+        // for checks like "some qkeyevent == QKeySequence::Copy" to work even
+        // when using for example 'russian' keyboard layout.
+        if (!QXkbCommon::isLatin(keysym)) {
+            xkb_keysym_t latinKeysym = QXkbCommon::lookupLatinKeysym(state, code);
+            if (latinKeysym != XKB_KEY_NoSymbol)
+                keysym = latinKeysym;
+        }
+    }
+
+    return keysymToQtKey_internal(keysym, modifiers, state, code, superAsMeta, hyperAsMeta);
+}
+
+static int keysymToQtKey_internal(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                                  xkb_state *state, xkb_keycode_t code,
+                                  bool superAsMeta, bool hyperAsMeta)
+{
+    int qtKey = 0;
+
+    // lookup from direct mapping
+    if (keysym >= XKB_KEY_F1 && keysym <= XKB_KEY_F35) {
+        // function keys
+        qtKey = Qt::Key_F1 + (keysym - XKB_KEY_F1);
+    } else if (keysym >= XKB_KEY_KP_0 && keysym <= XKB_KEY_KP_9) {
+        // numeric keypad keys
+        qtKey = Qt::Key_0 + (keysym - XKB_KEY_KP_0);
+    } else if (QXkbCommon::isLatin(keysym)) {
+        qtKey = QXkbCommon::qxkbcommon_xkb_keysym_to_upper(keysym);
+    } else {
+        // check if we have a direct mapping
+        xkb2qt_t searchKey{keysym, 0};
+        auto it = std::lower_bound(KeyTbl.cbegin(), KeyTbl.cend(), searchKey);
+        if (it != KeyTbl.end() && !(searchKey < *it))
+            qtKey = it->qt;
+    }
+
+    if (qtKey)
+        return qtKey;
+
+    // lookup from unicode
+    QString text;
+    if (!state || modifiers & Qt::ControlModifier) {
+        // Control modifier changes the text to ASCII control character, therefore we
+        // can't use this text to map keysym to a qt key. We can use the same keysym
+        // (it is not affectd by transformation) to obtain untransformed text. For details
+        // see "Appendix A. Default Symbol Transformations" in the XKB specification.
+        text = QXkbCommon::lookupStringNoKeysymTransformations(keysym);
+    } else {
+        text = QXkbCommon::lookupString(state, code);
+    }
+    if (!text.isEmpty()) {
+         if (text.unicode()->isDigit()) {
+             // Ensures that also non-latin digits are mapped to corresponding qt keys,
+             // e.g CTRL + ۲ (arabic two), is mapped to CTRL + Qt::Key_2.
+             qtKey = Qt::Key_0 + text.unicode()->digitValue();
+         } else {
+             qtKey = text.unicode()->toUpper().unicode();
+         }
+    }
+
+    // translate Super/Hyper keys to Meta if we're using them as the MetaModifier
+    if (superAsMeta && (qtKey == Qt::Key_Super_L || qtKey == Qt::Key_Super_R))
+        qtKey = Qt::Key_Meta;
+    if (hyperAsMeta && (qtKey == Qt::Key_Hyper_L || qtKey == Qt::Key_Hyper_R))
+        qtKey = Qt::Key_Meta;
+
+    return qtKey;
+}
+
+Qt::KeyboardModifiers QXkbCommon::modifiers(struct xkb_state *state)
+{
+    Qt::KeyboardModifiers modifiers = Qt::NoModifier;
+
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_CTRL, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::ControlModifier;
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_ALT, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::AltModifier;
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_SHIFT, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::ShiftModifier;
+    if (xkb_state_mod_name_is_active(state, XKB_MOD_NAME_LOGO, XKB_STATE_MODS_EFFECTIVE) > 0)
+        modifiers |= Qt::MetaModifier;
+
+    return modifiers;
+}
+
+// Possible modifier states.
+static const Qt::KeyboardModifiers ModsTbl[] = {
+    Qt::NoModifier,                                             // 0
+    Qt::ShiftModifier,                                          // 1
+    Qt::ControlModifier,                                        // 2
+    Qt::ControlModifier | Qt::ShiftModifier,                    // 3
+    Qt::AltModifier,                                            // 4
+    Qt::AltModifier | Qt::ShiftModifier,                        // 5
+    Qt::AltModifier | Qt::ControlModifier,                      // 6
+    Qt::AltModifier | Qt::ShiftModifier | Qt::ControlModifier,  // 7
+    Qt::NoModifier                                              // Fall-back to raw Key_*, for non-latin1 kb layouts
+};
+
+QList<int> QXkbCommon::possibleKeys(xkb_state *state, const QKeyEvent *event,
+                                    bool superAsMeta, bool hyperAsMeta)
+{
+    QList<int> result;
+    quint32 keycode = event->nativeScanCode();
+    Qt::KeyboardModifiers modifiers = event->modifiers();
+    xkb_keymap *keymap = xkb_state_get_keymap(state);
+    // turn off the modifier bits which doesn't participate in shortcuts
+    Qt::KeyboardModifiers notNeeded = Qt::KeypadModifier | Qt::GroupSwitchModifier;
+    modifiers &= ~notNeeded;
+    // create a fresh kb state and test against the relevant modifier combinations
+    ScopedXKBState scopedXkbQueryState(xkb_state_new(keymap));
+    xkb_state *queryState = scopedXkbQueryState.get();
+    if (!queryState) {
+        qCWarning(lcXkbcommon) << Q_FUNC_INFO << "failed to compile xkb keymap";
+        return result;
+    }
+    // get kb state from the master state and update the temporary state
+    xkb_layout_index_t lockedLayout = xkb_state_serialize_layout(state, XKB_STATE_LAYOUT_LOCKED);
+    xkb_mod_mask_t latchedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LATCHED);
+    xkb_mod_mask_t lockedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LOCKED);
+    xkb_mod_mask_t depressedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_DEPRESSED);
+    xkb_state_update_mask(queryState, depressedMods, latchedMods, lockedMods, 0, 0, lockedLayout);
+    // handle shortcuts for level three and above
+    xkb_layout_index_t layoutIndex = xkb_state_key_get_layout(queryState, keycode);
+    xkb_level_index_t levelIndex = 0;
+    if (layoutIndex != XKB_LAYOUT_INVALID) {
+        levelIndex = xkb_state_key_get_level(queryState, keycode, layoutIndex);
+        if (levelIndex == XKB_LEVEL_INVALID)
+            levelIndex = 0;
+    }
+    if (levelIndex <= 1)
+        xkb_state_update_mask(queryState, 0, latchedMods, lockedMods, 0, 0, lockedLayout);
+
+    xkb_keysym_t sym = xkb_state_key_get_one_sym(queryState, keycode);
+    if (sym == XKB_KEY_NoSymbol)
+        return result;
+
+    int baseQtKey = keysymToQtKey_internal(sym, modifiers, queryState, keycode, superAsMeta, hyperAsMeta);
+    if (baseQtKey)
+        result += (baseQtKey + modifiers);
+
+    xkb_mod_index_t shiftMod = xkb_keymap_mod_get_index(keymap, "Shift");
+    xkb_mod_index_t altMod = xkb_keymap_mod_get_index(keymap, "Alt");
+    xkb_mod_index_t controlMod = xkb_keymap_mod_get_index(keymap, "Control");
+    xkb_mod_index_t metaMod = xkb_keymap_mod_get_index(keymap, "Meta");
+
+    Q_ASSERT(shiftMod < 32);
+    Q_ASSERT(altMod < 32);
+    Q_ASSERT(controlMod < 32);
+
+    xkb_mod_mask_t depressed;
+    int qtKey = 0;
+    // obtain a list of possible shortcuts for the given key event
+    for (uint i = 1; i < sizeof(ModsTbl) / sizeof(*ModsTbl) ; ++i) {
+        Qt::KeyboardModifiers neededMods = ModsTbl[i];
+        if ((modifiers & neededMods) == neededMods) {
+            if (i == 8) {
+                if (isLatin(baseQtKey))
+                    continue;
+                // add a latin key as a fall back key
+                sym = lookupLatinKeysym(state, keycode);
+            } else {
+                depressed = 0;
+                if (neededMods & Qt::AltModifier)
+                    depressed |= (1 << altMod);
+                if (neededMods & Qt::ShiftModifier)
+                    depressed |= (1 << shiftMod);
+                if (neededMods & Qt::ControlModifier)
+                    depressed |= (1 << controlMod);
+                if (metaMod < 32 && neededMods & Qt::MetaModifier)
+                    depressed |= (1 << metaMod);
+                xkb_state_update_mask(queryState, depressed, latchedMods, lockedMods, 0, 0, lockedLayout);
+                sym = xkb_state_key_get_one_sym(queryState, keycode);
+            }
+            if (sym == XKB_KEY_NoSymbol)
+                continue;
+
+            Qt::KeyboardModifiers mods = modifiers & ~neededMods;
+            qtKey = keysymToQtKey_internal(sym, mods, queryState, keycode, superAsMeta, hyperAsMeta);
+            if (!qtKey || qtKey == baseQtKey)
+                continue;
+
+            // catch only more specific shortcuts, i.e. Ctrl+Shift+= also generates Ctrl++ and +,
+            // but Ctrl++ is more specific than +, so we should skip the last one
+            bool ambiguous = false;
+            for (int shortcut : qAsConst(result)) {
+                if (int(shortcut & ~Qt::KeyboardModifierMask) == qtKey && (shortcut & mods) == mods) {
+                    ambiguous = true;
+                    break;
+                }
+            }
+            if (ambiguous)
+                continue;
+
+            result += (qtKey + mods);
+        }
+    }
+
+    return result;
+}
+
+void QXkbCommon::verifyHasLatinLayout(xkb_keymap *keymap)
+{
+    const xkb_layout_index_t layoutCount = xkb_keymap_num_layouts(keymap);
+    const xkb_keycode_t minKeycode = xkb_keymap_min_keycode(keymap);
+    const xkb_keycode_t maxKeycode = xkb_keymap_max_keycode(keymap);
+
+    const xkb_keysym_t *keysyms = nullptr;
+    int nrLatinKeys = 0;
+    for (xkb_layout_index_t layout = 0; layout < layoutCount; ++layout) {
+        for (xkb_keycode_t code = minKeycode; code < maxKeycode; ++code) {
+            xkb_keymap_key_get_syms_by_level(keymap, code, layout, 0, &keysyms);
+            if (keysyms && isLatin(keysyms[0]))
+                nrLatinKeys++;
+            if (nrLatinKeys > 10) // arbitrarily chosen threshold
+                return;
+        }
+    }
+    // This means that lookupLatinKeysym() will not find anything and latin
+    // key shortcuts might not work. This is a bug in the affected desktop
+    // environment. Usually can be solved via system settings by adding e.g. 'us'
+    // layout to the list of seleced layouts, or by using command line, "setxkbmap
+    // -layout rus,en". The position of latin key based layout in the list of the
+    // selected layouts is irrelevant. Properly functioning desktop environments
+    // handle this behind the scenes, even if no latin key based layout has been
+    // explicitly listed in the selected layouts.
+    qCDebug(lcXkbcommon, "no keyboard layouts with latin keys present");
+}
+
+xkb_keysym_t QXkbCommon::lookupLatinKeysym(xkb_state *state, xkb_keycode_t keycode)
+{
+    xkb_layout_index_t layout;
+    xkb_keysym_t sym = XKB_KEY_NoSymbol;
+    xkb_keymap *keymap = xkb_state_get_keymap(state);
+    const xkb_layout_index_t layoutCount = xkb_keymap_num_layouts_for_key(keymap, keycode);
+    const xkb_layout_index_t currentLayout = xkb_state_key_get_layout(state, keycode);
+    // Look at user layouts in the order in which they are defined in system
+    // settings to find a latin keysym.
+    for (layout = 0; layout < layoutCount; ++layout) {
+        if (layout == currentLayout)
+            continue;
+        const xkb_keysym_t *syms = nullptr;
+        xkb_level_index_t level = xkb_state_key_get_level(state, keycode, layout);
+        if (xkb_keymap_key_get_syms_by_level(keymap, keycode, layout, level, &syms) != 1)
+            continue;
+        if (isLatin(syms[0])) {
+            sym = syms[0];
+            break;
+        }
+    }
+
+    if (sym == XKB_KEY_NoSymbol)
+        return sym;
+
+    xkb_mod_mask_t latchedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LATCHED);
+    xkb_mod_mask_t lockedMods = xkb_state_serialize_mods(state, XKB_STATE_MODS_LOCKED);
+
+    // Check for uniqueness, consider the following setup:
+    // setxkbmap -layout us,ru,us -variant dvorak,, -option 'grp:ctrl_alt_toggle' (set 'ru' as active).
+    // In this setup, the user would expect to trigger a ctrl+q shortcut by pressing ctrl+<physical x key>,
+    // because "US dvorak" is higher up in the layout settings list. This check verifies that an obtained
+    // 'sym' can not be acquired by any other layout higher up in the user's layout list. If it can be acquired
+    // then the obtained key is not unique. This prevents ctrl+<physical q key> from generating a ctrl+q
+    // shortcut in the above described setup. We don't want ctrl+<physical x key> and ctrl+<physical q key> to
+    // generate the same shortcut event in this case.
+    const xkb_keycode_t minKeycode = xkb_keymap_min_keycode(keymap);
+    const xkb_keycode_t maxKeycode = xkb_keymap_max_keycode(keymap);
+    ScopedXKBState queryState(xkb_state_new(keymap));
+    for (xkb_layout_index_t prevLayout = 0; prevLayout < layout; ++prevLayout) {
+        xkb_state_update_mask(queryState.get(), 0, latchedMods, lockedMods, 0, 0, prevLayout);
+        for (xkb_keycode_t code = minKeycode; code < maxKeycode; ++code) {
+            xkb_keysym_t prevSym = xkb_state_key_get_one_sym(queryState.get(), code);
+            if (prevSym == sym) {
+                sym = XKB_KEY_NoSymbol;
+                break;
+            }
+        }
+    }
+
+    return sym;
+}
+
+QT_END_NAMESPACE
diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon_3rdparty.cpp b/src/platformsupport/input/xkbcommon/qxkbcommon_3rdparty.cpp
new file mode 100644
index 0000000000..08f43b3b72
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/qxkbcommon_3rdparty.cpp
@@ -0,0 +1,219 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/* Copyright 1985, 1987, 1990, 1998  The Open Group
+
+   Permission is hereby granted, free of charge, to any person obtaining a
+   copy of this software and associated documentation files (the "Software"),
+   to deal in the Software without restriction, including without limitation
+   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+   and/or sell copies of the Software, and to permit persons to whom the
+   Software is furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+   Except as contained in this notice, the names of the authors or their
+   institutions shall not be used in advertising or otherwise to promote the
+   sale, use or other dealings in this Software without prior written
+   authorization from the authors.
+
+
+
+   Copyright © 2009 Dan Nicholson
+
+   Permission is hereby granted, free of charge, to any person obtaining a
+   copy of this software and associated documentation files (the "Software"),
+   to deal in the Software without restriction, including without limitation
+   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+   and/or sell copies of the Software, and to permit persons to whom the
+   Software is furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice (including the next
+   paragraph) shall be included in all copies or substantial portions of the
+   Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+*/
+
+/*
+ XConvertCase was copied from src/3rdparty/xkbcommon/src/keysym.c
+ The following code modifications were applied:
+
+ XConvertCase() was renamed to xkbcommon_XConvertCase(), to not confuse it
+ with Xlib's XConvertCase().
+
+ UCSConvertCase() was renamed to qt_UCSConvertCase() and function's body was
+ replaced to use Qt APIs for doing case conversion, which should give us better
+ results instead of using the less complete version from keysym.c
+*/
+
+#include "qxkbcommon_p.h"
+
+#include <QtCore/QChar>
+
+static void qt_UCSConvertCase(uint32_t code, xkb_keysym_t *lower, xkb_keysym_t *upper)
+{
+    *lower = QChar::toLower(code);
+    *upper = QChar::toUpper(code);
+}
+
+void QXkbCommon::xkbcommon_XConvertCase(xkb_keysym_t sym, xkb_keysym_t *lower, xkb_keysym_t *upper)
+{
+    /* Latin 1 keysym */
+    if (sym < 0x100) {
+        qt_UCSConvertCase(sym, lower, upper);
+        return;
+    }
+
+    /* Unicode keysym */
+    if ((sym & 0xff000000) == 0x01000000) {
+        qt_UCSConvertCase((sym & 0x00ffffff), lower, upper);
+        *upper |= 0x01000000;
+        *lower |= 0x01000000;
+        return;
+    }
+
+    /* Legacy keysym */
+
+    *lower = sym;
+    *upper = sym;
+
+    switch (sym >> 8) {
+    case 1: /* Latin 2 */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym == XKB_KEY_Aogonek)
+            *lower = XKB_KEY_aogonek;
+        else if (sym >= XKB_KEY_Lstroke && sym <= XKB_KEY_Sacute)
+            *lower += (XKB_KEY_lstroke - XKB_KEY_Lstroke);
+        else if (sym >= XKB_KEY_Scaron && sym <= XKB_KEY_Zacute)
+            *lower += (XKB_KEY_scaron - XKB_KEY_Scaron);
+        else if (sym >= XKB_KEY_Zcaron && sym <= XKB_KEY_Zabovedot)
+            *lower += (XKB_KEY_zcaron - XKB_KEY_Zcaron);
+        else if (sym == XKB_KEY_aogonek)
+            *upper = XKB_KEY_Aogonek;
+        else if (sym >= XKB_KEY_lstroke && sym <= XKB_KEY_sacute)
+            *upper -= (XKB_KEY_lstroke - XKB_KEY_Lstroke);
+        else if (sym >= XKB_KEY_scaron && sym <= XKB_KEY_zacute)
+            *upper -= (XKB_KEY_scaron - XKB_KEY_Scaron);
+        else if (sym >= XKB_KEY_zcaron && sym <= XKB_KEY_zabovedot)
+            *upper -= (XKB_KEY_zcaron - XKB_KEY_Zcaron);
+        else if (sym >= XKB_KEY_Racute && sym <= XKB_KEY_Tcedilla)
+            *lower += (XKB_KEY_racute - XKB_KEY_Racute);
+        else if (sym >= XKB_KEY_racute && sym <= XKB_KEY_tcedilla)
+            *upper -= (XKB_KEY_racute - XKB_KEY_Racute);
+        break;
+    case 2: /* Latin 3 */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Hstroke && sym <= XKB_KEY_Hcircumflex)
+            *lower += (XKB_KEY_hstroke - XKB_KEY_Hstroke);
+        else if (sym >= XKB_KEY_Gbreve && sym <= XKB_KEY_Jcircumflex)
+            *lower += (XKB_KEY_gbreve - XKB_KEY_Gbreve);
+        else if (sym >= XKB_KEY_hstroke && sym <= XKB_KEY_hcircumflex)
+            *upper -= (XKB_KEY_hstroke - XKB_KEY_Hstroke);
+        else if (sym >= XKB_KEY_gbreve && sym <= XKB_KEY_jcircumflex)
+            *upper -= (XKB_KEY_gbreve - XKB_KEY_Gbreve);
+        else if (sym >= XKB_KEY_Cabovedot && sym <= XKB_KEY_Scircumflex)
+            *lower += (XKB_KEY_cabovedot - XKB_KEY_Cabovedot);
+        else if (sym >= XKB_KEY_cabovedot && sym <= XKB_KEY_scircumflex)
+            *upper -= (XKB_KEY_cabovedot - XKB_KEY_Cabovedot);
+        break;
+    case 3: /* Latin 4 */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Rcedilla && sym <= XKB_KEY_Tslash)
+            *lower += (XKB_KEY_rcedilla - XKB_KEY_Rcedilla);
+        else if (sym >= XKB_KEY_rcedilla && sym <= XKB_KEY_tslash)
+            *upper -= (XKB_KEY_rcedilla - XKB_KEY_Rcedilla);
+        else if (sym == XKB_KEY_ENG)
+            *lower = XKB_KEY_eng;
+        else if (sym == XKB_KEY_eng)
+            *upper = XKB_KEY_ENG;
+        else if (sym >= XKB_KEY_Amacron && sym <= XKB_KEY_Umacron)
+            *lower += (XKB_KEY_amacron - XKB_KEY_Amacron);
+        else if (sym >= XKB_KEY_amacron && sym <= XKB_KEY_umacron)
+            *upper -= (XKB_KEY_amacron - XKB_KEY_Amacron);
+        break;
+    case 6: /* Cyrillic */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Serbian_DJE && sym <= XKB_KEY_Serbian_DZE)
+            *lower -= (XKB_KEY_Serbian_DJE - XKB_KEY_Serbian_dje);
+        else if (sym >= XKB_KEY_Serbian_dje && sym <= XKB_KEY_Serbian_dze)
+            *upper += (XKB_KEY_Serbian_DJE - XKB_KEY_Serbian_dje);
+        else if (sym >= XKB_KEY_Cyrillic_YU && sym <= XKB_KEY_Cyrillic_HARDSIGN)
+            *lower -= (XKB_KEY_Cyrillic_YU - XKB_KEY_Cyrillic_yu);
+        else if (sym >= XKB_KEY_Cyrillic_yu && sym <= XKB_KEY_Cyrillic_hardsign)
+            *upper += (XKB_KEY_Cyrillic_YU - XKB_KEY_Cyrillic_yu);
+        break;
+    case 7: /* Greek */
+        /* Assume the KeySym is a legal value (ignore discontinuities) */
+        if (sym >= XKB_KEY_Greek_ALPHAaccent && sym <= XKB_KEY_Greek_OMEGAaccent)
+            *lower += (XKB_KEY_Greek_alphaaccent - XKB_KEY_Greek_ALPHAaccent);
+        else if (sym >= XKB_KEY_Greek_alphaaccent && sym <= XKB_KEY_Greek_omegaaccent &&
+             sym != XKB_KEY_Greek_iotaaccentdieresis &&
+             sym != XKB_KEY_Greek_upsilonaccentdieresis)
+            *upper -= (XKB_KEY_Greek_alphaaccent - XKB_KEY_Greek_ALPHAaccent);
+        else if (sym >= XKB_KEY_Greek_ALPHA && sym <= XKB_KEY_Greek_OMEGA)
+            *lower += (XKB_KEY_Greek_alpha - XKB_KEY_Greek_ALPHA);
+        else if (sym >= XKB_KEY_Greek_alpha && sym <= XKB_KEY_Greek_omega &&
+             sym != XKB_KEY_Greek_finalsmallsigma)
+            *upper -= (XKB_KEY_Greek_alpha - XKB_KEY_Greek_ALPHA);
+        break;
+    case 0x13: /* Latin 9 */
+        if (sym == XKB_KEY_OE)
+            *lower = XKB_KEY_oe;
+        else if (sym == XKB_KEY_oe)
+            *upper = XKB_KEY_OE;
+        else if (sym == XKB_KEY_Ydiaeresis)
+            *lower = XKB_KEY_ydiaeresis;
+        break;
+    }
+}
diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon_p.h b/src/platformsupport/input/xkbcommon/qxkbcommon_p.h
new file mode 100644
index 0000000000..475c51ad91
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/qxkbcommon_p.h
@@ -0,0 +1,118 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QXKBCOMMON_P_H
+#define QXKBCOMMON_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/QString>
+#include <QtCore/QVector>
+#include <QtCore/QLoggingCategory>
+#include <QtCore/QList>
+
+#include <xkbcommon/xkbcommon.h>
+
+#include <memory>
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcXkbcommon)
+
+class QKeyEvent;
+
+class QXkbCommon
+{
+public:
+    static QString lookupString(struct xkb_state *state, xkb_keycode_t code);
+    static QString lookupStringNoKeysymTransformations(xkb_keysym_t keysym);
+
+    static QVector<xkb_keysym_t> toKeysym(QKeyEvent *event);
+
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers);
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                             xkb_state *state, xkb_keycode_t code,
+                             bool superAsMeta = false, bool hyperAsMeta = false);
+
+    // xkbcommon_* API is part of libxkbcommon internals, with modifications as
+    // desribed in the header of the implementation file.
+    static void xkbcommon_XConvertCase(xkb_keysym_t sym, xkb_keysym_t *lower, xkb_keysym_t *upper);
+    static xkb_keysym_t qxkbcommon_xkb_keysym_to_upper(xkb_keysym_t ks);
+
+    static Qt::KeyboardModifiers modifiers(struct xkb_state *state);
+
+    static QList<int> possibleKeys(xkb_state *state, const QKeyEvent *event,
+                                   bool superAsMeta = false, bool hyperAsMeta = false);
+
+    static void verifyHasLatinLayout(xkb_keymap *keymap);
+    static xkb_keysym_t lookupLatinKeysym(xkb_state *state, xkb_keycode_t keycode);
+
+    static bool isLatin(xkb_keysym_t sym) {
+        return ((sym >= 'a' && sym <= 'z') || (sym >= 'A' && sym <= 'Z'));
+    }
+    static bool isKeypad(xkb_keysym_t sym) {
+        return sym >= XKB_KEY_KP_Space && sym <= XKB_KEY_KP_9;
+    }
+
+    struct XKBStateDeleter {
+        void operator()(struct xkb_state *state) const { return xkb_state_unref(state); }
+    };
+    struct XKBKeymapDeleter {
+        void operator()(struct xkb_keymap *keymap) const { return xkb_keymap_unref(keymap); }
+    };
+    struct XKBContextDeleter {
+        void operator()(struct xkb_context *context) const { return xkb_context_unref(context); }
+    };
+    using ScopedXKBState = std::unique_ptr<struct xkb_state, XKBStateDeleter>;
+    using ScopedXKBKeymap = std::unique_ptr<struct xkb_keymap, XKBKeymapDeleter>;
+    using ScopedXKBContext = std::unique_ptr<struct xkb_context, XKBContextDeleter>;
+};
+
+QT_END_NAMESPACE
+
+#endif // QXKBCOMMON_P_H
diff --git a/src/platformsupport/input/xkbcommon/xkbcommon.pro b/src/platformsupport/input/xkbcommon/xkbcommon.pro
new file mode 100644
index 0000000000..2f5d132b5c
--- /dev/null
+++ b/src/platformsupport/input/xkbcommon/xkbcommon.pro
@@ -0,0 +1,23 @@
+TARGET = QtXkbCommonSupport
+MODULE = xkbcommon_support
+
+QT = core-private gui-private
+CONFIG += static internal_module
+
+DEFINES += QT_NO_CAST_FROM_ASCII
+PRECOMPILED_HEADER = ../../../corelib/global/qt_pch.h
+
+QMAKE_USE_PRIVATE += xkbcommon
+
+HEADERS += \
+    qxkbcommon_p.h
+
+SOURCES += \
+    qxkbcommon.cpp \
+    qxkbcommon_3rdparty.cpp
+
+# qxkbcommon.cpp::KeyTbl has more than 256 levels of expansion and older
+# Clang uses that as a limit (it's 1024 in current versions).
+clang:!intel_icc: QMAKE_CXXFLAGS += -ftemplate-depth=1024
+
+load(qt_module)