I have a secondary panel on my left screen edge, configured to auto-hide. When I move my mouse cursor to the left screen edge, it triggers the unhide action and the panel is shown. However, the trigger keeps triggering even if the panel is already shown, resulting in the panel "flashing" (i.e. restarting the unhide animation) whenever the mouse cursor hits the edge.
Possibly a flashing bug https://bugs.kde.org/show_bug.cgi?id=375321
Check back on this, and unfortunately this is still happening with Plasma 5.19.1
Can you confirm if it's the same as the link above (there's a video there) where a panel is autohide and there's a screen edge action on the left edge.
Difficult to tell. I enabled the present windows effect to trigger on the left screen edge, and it behaves similarly to the panel, but it's not quick as mentioned in the other bug report, but maybe that's because it's a different effect (window switcher doesn't do anything for me) Present windows appears and disappears every time I hit the screen edge with the cursor, similar to the behavior of the panel with the exception that the panel unhide initially triggers twice, while present windows effect on triggers once (doesn't immediately unhide and reappear again). I think that difference is just because of a different timer or timing setting though. If I move the cursor very slowly to the panel and trigger it very carefully, it also only triggers the unhide once. If there's a constant cursor movement to the left, both the panel and the present windows effect will re-trigger in intervals, though the intervals appear to be shorter for the panel. With the present windows effect configured on the left screen edge, when I first hit the left edge, the panel unhides, and subsequent hits of the edge trigger present windows. With "No action" configured on the left screen edge I get the initial behavior described in my bug report, where the panel re-unhides every time you hit the screen edge.
>where the panel re-unhides every time you hit the screen edge. As in, it is visible, then you hit the left edge and it restarts the animation?
Created attachment 130277 [details] Screen recording Made a screen recording of my own that should show it pretty well.
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Forgot to set it back to reported when I posted the screen recording
*** Bug 425571 has been marked as a duplicate of this bug. ***
Fixed for me in 5.21.1 (didn't test 5.21.0, so could be fixed there too)
*** Bug 422057 has been marked as a duplicate of this bug. ***
*** Bug 425167 has been marked as a duplicate of this bug. ***