Created attachment 121462 [details] Screenshot of the issue SUMMARY If I open any widget for the first time, I can see its content just fine, but making second and other attempts results into showing a popup with an empty content with a weird glitch on second screen. STEPS TO REPRODUCE 1. Open any widget (e.g. calendar) 2. Open it again OBSERVED RESULT See attached screenshot. EXPECTED RESULT See the widget content properly. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora 30 (available in About System) KDE Plasma Version: Plasma 5.16.2 KDE Frameworks Version: 5.59 Qt Version: 5.12.4 (+ backported patches for qtwayland) ADDITIONAL INFORMATION I have a setup with three screens, the first one is my laptop with 4k screen (2x scaling set), rest of screens are regular full HD displays (no scaling). I think this issue is not reproducible or not reproducible that often when I have just the laptop screen, I will verify.
Just tested with single screen and the issue is not reproducible, only in multi-screen setup and I think I have seen this issue even with older Plasma versions (definitely with Plasma 5.15.x).
David, this seems to be related to your Qt fix https://codereview.qt-project.org/c/qt/qtwayland/+/265999. With this applied on top of Qt 5.12.4, I can reproduce it, if I disable that patch in our qtwayland in Fedora, then it's not happening. Problem is that without that patch I have problem with menus showing up (https://bugreports.qt.io/browse/QTBUG-76324).
It looks that the commit in qtbase making the menus not showing has been reverted. David, does it mean that it's safe not to apply that patch I mentioned which makes the widget not showing for me? See: https://github.com/qt/qtbase/commit/deac052a40c93633041da058d5c73c9e91aa76c7
Cannot reproduce in current git master with Qt 5.15.2. Can you?
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This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!