SUMMARY You have to hide and restore window in order for global menu to appear SOFTWARE/OS VERSIONS KDE Plasma Version: 5.18.90 KDE Frameworks Version: 5.70 Qt Version: 5.15
I Have the same problem in the final 5.19 Version KDE Plasma Version: 5.19.0 KDE Frameworks Version: 5.15.0 QT Version: 5.15.0
*** This bug has been marked as a duplicate of bug 422786 ***
But i have whis problem with all applications, qt and gtk, seems like this bug was closed wrongly
For example, it happens with dolphin after fresh start, nothing gtk related is involved
I can confirm this on wayland this happens every time
Git commit 16613309be67fde120c9b6f1af0c761f794edec4 by Carson Black. Committed on 18/06/2020 at 22:17. Pushed by cblack into branch 'master'. [applets/appmenu] Listen to more signals to ensure that appmenu applet can reliably catch the active window changing Related: bug 422786 M +3 -0 applets/appmenu/plugin/appmenumodel.cpp https://invent.kde.org/plasma/plasma-workspace/commit/16613309be67fde120c9b6f1af0c761f794edec4
Git commit fe302963030be0ef137d3b04343cdfbe75887669 by Carson Black. Committed on 18/06/2020 at 22:29. Pushed by cblack into branch 'Plasma/5.19'. [applets/appmenu] Listen to more signals to ensure that appmenu applet can reliably catch the active window changing Related: bug 422786 M +3 -0 applets/appmenu/plugin/appmenumodel.cpp https://invent.kde.org/plasma/plasma-workspace/commit/fe302963030be0ef137d3b04343cdfbe75887669