Alt-F Crash fix #11328
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Debugging does not reveal anything. It turns out hat the stored pointer in the actions is a QPointer that cannot become dangling. |
| // Fix for "No menu bar with ubuntu unity in full screen mode" Bug | ||
| // #885890 and Bug #1076789. Before touching anything here, please read | ||
| // those bugs. | ||
| QApplication::setAttribute(Qt::AA_DontUseNativeMenuBar, true); |
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In my tests I did exactly that (just at the beginning of createMenuBar() depending on isFullScreen(), not directly before the call) and I did set it in main.cpp, not in mixxx.cpp.
So I wonder how that makes the difference...
Anyway, crash fixed!
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Great, that does the trick 🎉 Crash fixed on Ubuntu 20.04.5 with xfce + vala-appmenu-plugin |
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Cool, so we can merge this? |
This can easily be combined with #11313 (we can remove the hotkey popup) which fixes the issue with identical fullscreen shortcuts in OS and Mixxx. Thank you for looking into this! |
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FWIW still hitting the debug assert on shutdown because of leaked controls. |
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Is this related to this PR? Which one is leaked? |
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Unrelated, this happens every time after recreating the menubar. |
| QApplication::setAttribute( | ||
| Qt::AA_DontUseNativeMenuBar, | ||
| args.getStartInFullscreen() || fullscreenPref); | ||
| #endif // __LINUX__ |
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Note for future improvements:
it looks like this attribute is the only way to figure whether a platform uses native menus, so let's note the initial state before setting it. That way we could restrict recreating and reconnecting the menu to platforms that actually require/support it.
All Anyway, that's no regression. Thank you very much for digging! |
I'm about to add/refine the related comments. |
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Thank you. I have cherry picked the linked commit. |
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This PR does not use the probably broken broken QMenuBar::setNativeMenuBar(false) call.
Even though I still cannot reproduce the issue. It is obvious from the backtrace in #11320 that there is an issue that happens after
deleting the platformMenuBar here: https://github.com/qt/qtbase/blob/8c47a86eecd286dbe66ca55ed4deaaf0f901d13b/src/widgets/widgets/qmenubar.cpp#L1882
I assume that the final crash happens than here:
https://github.com/qt/qtbase/blob/8c47a86eecd286dbe66ca55ed4deaaf0f901d13b/src/widgets/widgets/qmenubar.cpp#L1767
because of a dangling pointer in the sub-menu actions.
It is still a puzzling why the crash does not happen here. At least all is still working tested on Linux Mint Mate, Ubuntu Unity and Ubuntu Desktop.
I will now single step through the code to discover the issue.
@ronso0 I hope this PR gives us the freedom to consider the best solution in your pending work without the fear of a crash.
Can you confirm the crash is fixed?