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Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.15.10, 6.3.1, 6.4.0 Beta1
Affects Version/s: 6.2.3, 6.2.4, 6.3.0
Component/s: QPA: X11/XCB
Labels:
None
Environment:
Linux/X11 (everything statically linked, bugged with arch version too)

Platform/s:

Linux/X11
Commits:
9b92c5314e (qt/qtbase/dev) 9b92c5314e (qt/tqtc-qtbase/dev) 0bc1d618dd (qt/qtbase/6.3) 7614f0ee21 (qt/tqtc-qtbase/5.15) 0bc1d618dd (qt/tqtc-qtbase/6.3) 7614f0ee21 (qt/tqtc-qtbase/tqtc/vxworks-5.15.10)

Qt applications (tested with telegram, reproduced with a minimal example ) ignore modifiers for key combinations containing shift/alt+gr (e.g. alt+gr+' with the Italian keyboard should output a backtick, but outputs a single quote instead).

Culprit (found with bisect) 6b8083a265fc012b28178b8fab619062e43a458a, (
https://github.com/qt/qtbase/commit/6b8083a265fc012b28178b8fab619062e43a458a)

The minimal example code:

#include "QtWidgets/QApplication"
#include "QtWidgets/QTextEdit"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTextEdit Editor;
    Editor.show();

    return a.exec();
}

Output of setxkbmap -print

19:54  ~  $ setxkbmap -print 
xkb_keymap {
	xkb_keycodes  { include "evdev+aliases(qwerty)"	};
	xkb_types     { include "complete"	};
	xkb_compat    { include "complete"	};
	xkb_symbols   { include "pc+it+inet(evdev)"	};
	xkb_geometry  { include "pc(pc105)"	};
};