Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with QFlags<Qt::KeyboardModifier>(NoModifier)

[Tom Goddard]

Mac ARM ChimeraX is logging many warnings

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with QFlags<Qt::KeyboardModifier>(NoModifier)

in ticket #7393.

[Tom Goddard]

This Qt bug report suggests this is probably caused by some modifier key press in a Qt text entry

​https://bugreports.qt.io/browse/QTBUG-95471

It looks like virtual key 36 might be the HOME key looking at the Qt 5 windows key mapper source code.

​https://code.woboq.org/qt5/qtbase/src/plugins/platforms/windows/qwindowskeymapper.cpp.html

[Tom Goddard]

Virtual keys 1, 8, 9, 36, and 51 appear in the warning messages of #7393, corresponding to VK_LBUTTON, Backspace, Tab, Home, and 3 key in the qwindowskeymapper.cpp. These may not be the right mappings for Mac. Here are the Qt:Key_X values

​https://doc.qt.io/qt-6/qt.html

I should probably just try typing lots of weird keys in an entry field. It may only happen on the ARM Mac ChimeraX so try in that.

[Tom Goddard]

In this sequence of warnings from ticket #7393 they seemed to try every combination of modifier keys

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(NoModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ControlModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier|ControlModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(AltModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier|AltModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ControlModifier|AltModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier|ControlModifier|AltModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(MetaModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier|MetaModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ControlModifier|MetaModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier|ControlModifier|MetaModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(AltModifier|MetaModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier|AltModifier|MetaModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ControlModifier|AltModifier|MetaModifier)  

Mismatch between Cocoa '\x0' and Carbon '\xd' for virtual key 36 with
QFlags<Qt::KeyboardModifier>(ShiftModifier|ControlModifier|AltModifier|MetaModifier)  

[Tom Goddard]

Here is the source code that is issuing the warning.

​https://code.woboq.org/qt6/qtbase/src/gui/platform/darwin/qapplekeymapper.mm.html#536

[Tom Goddard]

This bug also appears on Intel ChimeraX 1.4 on an Intel Mac, ticket #7397

[Tom Goddard]

This same warning was seen in April 2022 probably just after ChimeraX started using Qt 6.3.0, ticket #6710, and there are 6 tickets that contain the warning.

[Tom Goddard]

I tried pressing all manner of modifier keys and home, and other non alpha-numeric keys in command-line and help browser on M1 Mac and Intel Mac and never generated this warning. I guess the keys have to be typed to the right widget to get this error. Don't have any further ideas how to reproduce. In any case seems like a Qt bug.