SUMMARY When I click and drag a firefox tab down to the plasma panel, kwin appears to crash, but will recover 90% of the time and keep going STEPS TO REPRODUCE 1. In KDE plasma wayland, open a firefox windows 2. Click and drag any firefox tab, and release it over the panel OBSERVED RESULT The background goes black and the panel disappears, but any open windows remain, and the cursor is repsonsive. After a second the background usually comes back along with the panel. EXPECTED RESULT SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
(In reply to Grayson Penland from comment #0) > SUMMARY > When I click and drag a firefox tab down to the plasma panel, kwin appears > to crash, but will recover 90% of the time and keep going > > STEPS TO REPRODUCE > 1. In KDE plasma wayland, open a firefox windows > 2. Click and drag any firefox tab, and release it over the panel > > OBSERVED RESULT > The background goes black and the panel disappears, but any open windows > remain, and the cursor is repsonsive. After a second the background usually > comes back along with the panel. > > SOFTWARE/OS VERSIONS Linux/KDE Plasma: (available in About System) KDE Plasma Version: 5.20.5 KDE Frameworks Version: 5.78.0 Qt Version: 5.15.2 Fedora 33
From the given description, it sounds like plasmashell crashed.
*** This bug has been marked as a duplicate of bug 398440 ***