xcb: Update mouse buttons from MotionNotify events

We don't receive ButtonRelease event after closing a popup
by clicking outside of the client area. Thus the internal
state of mouse buttons in the xcb plugin becomes outdated
until we receive ButtonRelease event.

This commit updates the internal state of mouse buttons
from MotionNotify events. So when a user will move a mouse
on the client area, the xcb plugin will send a mouse event
with updated buttons to Qt Gui and QGuiApplication will
detect the following mouse events correctly.

Task-number: QTBUG-32609
Task-number: QTBUG-35065
Task-number: QTBUG-43776
Task-number: QTBUG-44166
Task-number: QTBUG-44231
Change-Id: Ica334dfbf04f7ef81db86b25262328fe5da11808
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Reviewed-by: Gatis Paeglis <gatis.paeglis@digia.com>

2 files changed, 11 insertions, 4 deletions

diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
index 5510c3b1b4..77e4601485 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
+++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
@@ -818,6 +818,15 @@ void QXcbConnection::handleButtonRelease(xcb_generic_event_t *ev)
     qCDebug(lcQpaXInput, "xcb: released mouse button %d, button state %X", event->detail, static_cast<unsigned int>(m_buttons));
 }
 
+void QXcbConnection::handleMotionNotify(xcb_generic_event_t *ev)
+{
+    xcb_motion_notify_event_t *event = (xcb_motion_notify_event_t *)ev;
+
+    m_buttons = (m_buttons & ~0x7) | translateMouseButtons(event->state);
+    if (Q_UNLIKELY(lcQpaXInput().isDebugEnabled()))
+        qDebug("xcb: moved mouse to %4d, %4d; button state %X", event->event_x, event->event_y, static_cast<unsigned int>(m_buttons));
+}
+
 #ifndef QT_NO_XKB
 namespace {
     typedef union {
@@ -868,11 +877,8 @@ void QXcbConnection::handleXcbEvent(xcb_generic_event_t *event)
             handleButtonRelease(event);
             HANDLE_PLATFORM_WINDOW_EVENT(xcb_button_release_event_t, event, handleButtonReleaseEvent);
         case XCB_MOTION_NOTIFY:
-            if (Q_UNLIKELY(lcQpaXInput().isDebugEnabled())) {
-                xcb_motion_notify_event_t *mev = (xcb_motion_notify_event_t *)event;
-                qDebug("xcb: moved mouse to %4d, %4d; button state %X", mev->event_x, mev->event_y, static_cast<unsigned int>(m_buttons));
-            }
             m_keyboard->updateXKBStateFromCore(((xcb_motion_notify_event_t *)event)->state);
+            handleMotionNotify(event);
             HANDLE_PLATFORM_WINDOW_EVENT(xcb_motion_notify_event_t, event, handleMotionNotifyEvent);
         case XCB_CONFIGURE_NOTIFY:
             HANDLE_PLATFORM_WINDOW_EVENT(xcb_configure_notify_event_t, event, handleConfigureNotifyEvent);
diff --git a/src/plugins/platforms/xcb/qxcbconnection.h b/src/plugins/platforms/xcb/qxcbconnection.h
index 4d0596550c..9a73006cec 100644
--- a/src/plugins/platforms/xcb/qxcbconnection.h
+++ b/src/plugins/platforms/xcb/qxcbconnection.h
@@ -496,6 +496,7 @@ private:
     void updateScreens();
     void handleButtonPress(xcb_generic_event_t *event);
     void handleButtonRelease(xcb_generic_event_t *event);
+    void handleMotionNotify(xcb_generic_event_t *event);
 
     bool m_xi2Enabled;
     int m_xi2Minor;