When focus moves from one window to another the panel pops up. See the attached video. Reproducible: Always Steps to Reproduce: 1. Set panel to auto-hide. 2. Let panel hide. 3. Switch to another window. 4. Panel shows up. Actual Results: Panel pops up when focus moves from one window to another. Expected Results: Panel stays hidden. It should pop up only when something is happening on the panel. It is very annoying :(
Created attachment 100194 [details] Video how the panel pops up.
Plasma 5.7 has a fully-rewritten Task Manager backend and I can't reproduce this there.
I've just updated to ... $ plasmashell --version plasmashell 5.7.4 Packages: plasma-desktop 4:5.7.4-1, plasma-framework (5.25.0-1), kwin-x11 (4:5.7.4-1) ... and it behaves exactly the same as before. However I found out that when I set panel to be overlapped with windows, the bug does not occur and it behaves correctly (except I don't want to see it when there is no window visible).