Bug 500699

Summary:	Drawing of submenu is broken
Product:	[Plasma] kwin	Reporter:	Piotr Mierzwinski <piotr.mierzwinski>
Component:	appmenu	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	kde, nate, piotr.mierzwinski
Priority:	NOR	Keywords:	wayland-only
Version First Reported In:	master
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	Qt 6.9.1
Sentry Crash Report:
Attachments:	issues with drawing submenu

Description Piotr Mierzwinski 2025-02-24 23:23:46 UTC

SUMMARY
Walking through menu in Kate I found couple issues related with drawing of submenu.
1. Unnatural increasing of drawn submenu window which looks like zoom - it happens when I walk through slowly options in main menu.
2. Big vertical squeeze of text in submenu - it happens usually when I open both submenus alternately (moving mouse cursor from one to second and back).

Please look at attached short movie.

STEPS TO REPRODUCE
Apply: Window Decoration -> Application Menu for "Breeze" decorations.

* submenu window which looks like zoom
1. Open Kate
2. Click into Application Menu (icon with three horizontal lines)
3. Walk through slowly all options from top to bottom

* vertical squeeze of text in submenu.
1. Open Kate (if not yet opened)
2. Go (move mouse cursor) to Sessions
3. Walk through slowly over "Recent Sessions" "All Sessions"

OBSERVED RESULT
* unnatural increasing of drawn submenu window which looks like zoom.
* vertical squeeze of text in submenu.

EXPECTED RESULT
Options in submenus should be drawing "normally"

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: YES
KDE Plasma Version: 6.3.80
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2
Wayland

HARDWARE
Graphics: Intel Xe Graphics (integrated)
Processor: Intel i7 11th Gen

ADDITIONAL INFORMATION
Today (2024/02/24) I applied updates in Neon.

Comment 1 Piotr Mierzwinski 2025-02-25 07:42:33 UTC

Created attachment 178853 [details]
issues with drawing submenu

Comment 2 Vlad Zahorodnii 2025-02-27 16:48:22 UTC

This seems like a QtWayland bug. If wp_viewporter is disabled, then there is no glitch.

Comment 3 Piotr Mierzwinski 2025-02-27 22:30:26 UTC

(In reply to Vlad Zahorodnii from comment #2)
> This seems like a QtWayland bug. If wp_viewporter is disabled, then there is
> no glitch.

So how to disable wp_viewporter. I mean is it possible to do it without compilation of code?

BTW. 
Testing latest Arch Linux. I found this issue also in Plasma 6.3.1 (Wayland). To be detailed issue was related with "unnatural increasing of drawn submenu"

Comment 4 Piotr Mierzwinski 2025-05-21 20:57:24 UTC

Since some time in Neon Unstable is available Qt-6.9.0, and I still observe reported issue.
I wonder if QtWayland bug has been fixed in version 6.9.

Comment 5 Vlad Zahorodnii 2025-05-22 08:52:03 UTC

I made a fix in qtwayland that I think _should_ address the issue. https://invent.kde.org/qt/qt/qtwayland/-/commit/d9441297d1799c349a14f05e0657fe928bbd2abd it's in Qt 6.9.1

Comment 6 Nate Graham 2025-05-22 15:33:24 UTC

OK great, let's assume that fixes it! Piotr, if you find that the issue is still present once you've got Qt 6.9.1, please feel free to re-open this bug report. Thanks everyone!