https://bugs.kde.org/show_bug.cgi?id=417905

--- Comment #27 from Alexander Glüsing <[email protected]> ---
One more Info. I am running Manjaro Linux, and i used the Firefox version out
of the Repositorys. (I don't know how to see if it is native or not) I think it
was a Version, that did not have enabled Wayland Support (as a native Wayland
client), So i installed the fedora-firefox-wayland-bin package from the AUR.
The firefox version which is patched to be a native Wayland client has not the
problem. I could use all Functions and use all links and it show the correct
behavior all over the whole Screen. While at the same time The standard repo
Version of Thunderbird has the Issue. (I guess it is a not native wayland
client - through xwayland)

Maybe it is importand that for me it seems to be every time the same region
which behaves false.

it is always the top left quarter of the 4k screen which is good, the rest
quarters are "bad". that screen that i every now and then change the scaling.
but it does not matter if i scale it down to 1080p and back or down to 1440p
and back to native (100%)

 - The affectet region stays the same while it is at 100%scale.
 - while i have it scales to 1440p there ist no "bad regeion"
 - while i have it scales to 1080p there ist no "bad regeion"

There is another indication what might get wrong:
 - if i use the scale factor 1.01
   (kscreen-doctor output.2.mode.0 output.2.scale.1.01)
   basically only 1% more pixels rendered and scaled to native Resolution then  
   there is no "bad" regeion 
 - if i use the scale factor 0.99 i again get the buggy region on the screen.
   but also with some luck? sometimes the bug disappersa. lets sy i change the
   scaling factor from 1.01 to 0.99 the bad region disappers in 0.99 factor.
But 
   i can trigger it immediately by scaling to factor 1.5 and back to 0.99 -
then 
   i have it again at 0.99

: it seems to be that only scaling factor's of 1 and lower (0.99↓) are
affected?  
  but to trigger it i need to scale somewhere above the factor 1.0 like 1.5
once 
  and back to 1 or lower

I used thunderbird to look for the bug by searching of the animation for links
(the links schould get lines under them) just as indicator.

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