I've researched the issue a bit more, based on the fact that the stack
trace shows calls to KDEPlasmaPlatformTheme.so from within QMenuBar. So
the issue is repeatable in the following circumstances:
- running on KDE Plasma
- having one (or more) Global Menu widgets in a panel or on the desktop
- having the setting "Application Style/Fine Tuning/Menubar Style" set to
"Application Menu widget" in the KDE System Settings application.
- The QMainWindow being added to the MDI area has a menu bar.
It does *not* occur when the Plasma Global Menu widget is not in use
(i.e. the setting "Application Style/Fine Tuning/Menubar Style" is set
to something else.
My conclusion, therefore, is that I need to report this as an issue for
KDE Plasma, so I'm closing this issue.
** Changed in: qt-sdk (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1728652
Title:
Qt app crashes when adding a QMainWindow derived widget to a QMdiArea
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