Created attachment 122624 [details] A small PyQt5 script, that demonstrates the ploblem If you toggle the systray icon with the attached test app, you loose both connected actions, the context menu (right click) and the dialog visibility toggling (left click). Note; the app can be closed without fuzz, if you close the dialog, while the systray icon is in hidden state. STEPS TO REPRODUCE 1. run attached app 2. toggle systray icon 3. click on systray icon with left and right button OBSERVED RESULT Neither the systray context menu is shown, after the systray icon is hidden once, nor it toggles the dialogs visibility anymore. EXPECTED RESULT Both actions should be available, after unhiding the systray icon. SOFTWARE/OS VERSIONS Linux/KDE Plasma: openSUSE Tumbleweed 20190907 KDE Plasma Version: 5.16.4 KDE Frameworks Version: 5.61.0 Qt Version: 5.13.0 ADDITIONAL INFORMATION This issue is not related to the PyQt5 implementation. Try the official Qt5 systray example. It behaves the same (but you cannot close it sanely after toggling..).
This is not a KDE bug. I tested Systray Example from Qt distribution (5.13.1), was working fine. I was able to reproduce using your example (python3), it is reproducible using qdbusviewer to. Run qdbusviewer, then run your example. It will add new item (for example ":1.45"). Open it, then "StatusNotifierItem" -> "org.kde.StatusNotifierItem" -> "Method: Activate" or "Method: ContextMenu". It shoud do the action. Now toggle the icon. Old item will be remove, new one added (for example ":1.46"). Now run the same method, Activate or ContextMenu. It will not work. This is probably a bug in PyQt5 or Qt5.
Thanks for confirmation. Will recheck with Qt 5.13.1.
Sorry, I was too quick with the judge. This is a KDE error, already reported. This is a duplicate of BUG 365105. *** This bug has been marked as a duplicate of bug 365105 ***