Bug 424535

Created attachment 130316 [details]
video showing the bug

SUMMARY
The global menubar widget does not seem to display the menu bars of gtk apps, unless "triggered" by an action on the desktop panel, such as opening and closing the Application Launcher. 

STEPS TO REPRODUCE
1. Make sure that the dependencies required to display GTK apps menu bars on the widget: https://bbs.archlinux.org/viewtopic.php?id=238072 (don't install the Qt4 ones)
2. Add the global menu widget to existing panel or right-click > Add Panel > Application Menu Bar
3. Open a GTK app (gimp, inkscape, etc) and notice how the application's menu bar was not displayed on the widget

OBSERVED RESULT
GTK apps' menu bars were not displayed on the widget

EXPECTED RESULT
GTK apps should have displayed their menubars on the widget immediately after opening

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.19.3
KDE Frameworks Version: 5.72.0
Qt Version: 5.15.0
Kernel Version: 5.7.9-zen1-1-zen
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-7200U CPU @ 2.50GHz
Memory: 11.5 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 620

ADDITIONAL INFORMATION