Created attachment 157755 [details]
konversation.png

SUMMARY
The new outline feature in 5.27 may be appreciated or not, but I would like to point out a couple of things that made me think that it was a bug at first.

I attached a few images to show what I see. If you zoom in a lot you'll clearly see the problems.

1. konversation.png: this image shows the bottom left corner of konversation. As you can see the left border has an outline, the bottom border does not seem to have the outline. The result is bad and seems buggy.

2. vlc.png: in this image, the outline looks identical on all sides. This does not seem buggy.

3. settings.png: the outline on the left and at the top is not contiguous to the window. There is a transparent line between the window and the outline. I do not clearly understand if this is expected, I do not think so, but in any case it does not seem to be consistent with what I see in other windows (like in vlc.png), and it is not even consistent with the outline at the bottom. This can also be seen in konversation.png.

STEPS TO REPRODUCE
1. 
2. 
3. 

OBSERVED RESULT
Outline is missing or mispositioned, inconsistent between different windows and even between sides of the same window.

EXPECTED RESULT
I am not sure what the expected result was. According to some images I saw online, like these https://invent.kde.org/plasma/breeze/uploads/2eeb591d95a296adfa2daee4a985351e/Screenshot_20230302_181452.png, I guess there shouldn't be a transparent line and the outline should be identical on all sides. I'd also expect it to be identical for all windows.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Linux: 6.1.21-1-MANJARO (64-bit) Wayland