Revert "Windows: Fix call of ToUnicode"

This reverts commit dfe853bff90444edf92a993e391df853780c9e8d.

When using cyrillic or other keyboard layouts, standard shortcuts
like CTRL-C are still supposed to work as if the US keyboard layout
were in effect.

Task-number: QTBUG-44021
Task-number: QTBUG-35734
Change-Id: If6cd96a1e03e62900b293f8e304e523460e85810
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/src/plugins/platforms/windows/qwindowskeymapper.cpp b/src/plugins/platforms/windows/qwindowskeymapper.cpp
index d781cdbe9c..4b1d1112d5 100644
--- a/src/plugins/platforms/windows/qwindowskeymapper.cpp
+++ b/src/plugins/platforms/windows/qwindowskeymapper.cpp
@@ -537,16 +537,15 @@ static inline int toKeyOrUnicode(int vk, int scancode, unsigned char *kbdBuffer,
     Q_ASSERT(vk > 0 && vk < 256);
     int code = 0;
     QChar unicodeBuffer[5];
-    // While key combinations containing alt and ctrl might trigger the third assignment of a key
-    // (for example "alt+ctrl+q" causes '@' on a German layout), ToUnicode often does not return the
-    // wanted character if only the ctrl modifier is used. Thus we unset this modifier temporarily
-    // if it is not used together with alt.
-    const unsigned char controlState = kbdBuffer[VK_MENU] ? 0 : kbdBuffer[VK_CONTROL];
-    if (controlState)
-        kbdBuffer[VK_CONTROL] = 0;
     int res = ToUnicode(vk, scancode, kbdBuffer, reinterpret_cast<LPWSTR>(unicodeBuffer), 5, 0);
-    if (controlState)
+    // When Ctrl modifier is used ToUnicode does not return correct values. In order to assign the
+    // right key the control modifier is removed for just that function if the previous call failed.
+    if (res == 0 && kbdBuffer[VK_CONTROL]) {
+        const unsigned char controlState = kbdBuffer[VK_CONTROL];
+        kbdBuffer[VK_CONTROL] = 0;
+        res = ToUnicode(vk, scancode, kbdBuffer, reinterpret_cast<LPWSTR>(unicodeBuffer), 5, 0);
         kbdBuffer[VK_CONTROL] = controlState;
+    }
     if (res)
         code = unicodeBuffer[0].toUpper().unicode();