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I searched the Qt 5.12 codebase for GroupSwitchModifier and it is not used in QKeySequence at all (qtbase/src/gui/kernel/qkeysequence.cpp). In fact it appears to not be supported in much code at all.
In Sigil 1.7 in KeyboardShortcutsWidget.cpp we build up the resulting modifier by checking modifier flags but do not handle the GroupSwitchModifier at all so it gets stripped out but the actual key() value reflects its use with altgr in the command line.
In current master, the key() with altgr in the command line does reflect its use but the GroupSwitchModifier is kept. And that seems to confuse QKeySequence since it does not grok the GroupSwitchModifier at all.
I will try in master or Windows checking for the GroupModifier and if set remove it before trying calibre's approach in the hopes everything just works.
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