qxkbcommon: UCS-4-encode surrogate characters in QKeyEvent::key()

Fixes: QTBUG-72776
Done-with: Liang Qi <liang.qi@qt.io>
Change-Id: I9d1f4e34527079c3bc460016fe9b953636b4d6cb
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Liang Qi <liang.qi@qt.io>
(cherry picked from commit 9ef69efb3bde086b593787efdda5ebd8f3544768)

1 files changed, 5 insertions, 1 deletions

diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon.cpp b/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
index e10f80f804..313e861585 100644
--- a/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
+++ b/src/platformsupport/input/xkbcommon/qxkbcommon.cpp
@@ -41,7 +41,9 @@
 
 #include <private/qmakearray_p.h>
 
+#include <QtCore/private/qstringiterator_p.h>
 #include <QtCore/QMetaMethod>
+
 #include <QtGui/QKeyEvent>
 #include <QtGui/private/qguiapplication_p.h>
 
@@ -574,7 +576,9 @@ static int keysymToQtKey_internal(xkb_keysym_t keysym, Qt::KeyboardModifiers mod
              // 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();
+             text = text.toUpper();
+             QStringIterator i(text);
+             qtKey = i.next(0);
          }
     }