Bug 419333

Summary:	[Wayland] Titlebar of a window turns black
Product:	[Plasma] kwin	Reporter:	Stefan K. <familiekuehn>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	kde
Priority:	NOR
Version First Reported In:	5.18.3
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Stefan K. 2020-03-28 12:43:27 UTC

SUMMARY

The titlebar of an application turns into a black box. You can still click the buttons or move it around. I am using the default breeze (light) appearance.


STEPS TO REPRODUCE
1. So far I only observed this on Xwayland clients and if it is "raised(?)". The german version says "Fensterheber" - so you can only see its titlebar/window decoration. I do not know what causes it, yet.


OBSERVED RESULT

The titlebar is rerendered correctly if I resize the window. Not using the maximize or minimize buttons.


EXPECTED RESULT

Obviously to keep its titlebar intact :)


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon (custom kernel 5.4.24)
KDE Plasma Version: 5.18.3
KDE Frameworks Version: 5.68.0
Qt Version: 5.14.1

Comment 1 Vlad Zahorodnii 2020-03-30 13:15:19 UTC

Can you reproduce this bug on X11?

Comment 2 Stefan K. 2020-03-31 21:22:04 UTC

I have been testing wayland for a few weeks to see how stable it got. I started with an empty kde configuration folder. Before that I used X11 for years (and occasional wayland tests) and have never encountered "black boxes". I may check, if I can reproduce it now on X11? But in the past (on neon bionic) it never happened.

Comment 3 Stefan K. 2020-04-19 12:42:34 UTC

There is a way not to get the titlebar black but make it disappear instead. I am Houdini ;)

I changed the window title font to something else and the "raised" window titlebar - of Thunderbird/Xwayland in my case - became invisible. If I doubleclick the title bar (to get the window contents back) it is visible again.

Sometimes this font changing crash plasmashell and leave the titlebar visible. I can upload a crashdump if you are interested?

Comment 4 David Redondo 2022-01-19 15:25:14 UTC

Can you still see this behavior. In the past I saw flickering titlebars but not anymore

Comment 5 Stefan K. 2022-01-27 21:04:36 UTC

I haven´t seen it for a long time, too. I guess it´s fixed for XWayland. Native windows don´t support it (yet).

Comment 6 Bug Janitor Service 2022-02-11 04:37:04 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

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If you have already provided the requested information, please
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