Bug 509979 - Popup menus are stuck to a portion of the screen under fractional scaling on Hyprland/Sway
Summary: Popup menus are stuck to a portion of the screen under fractional scaling on ...
Status: REPORTED
Alias: None
Product: Qt/KDE Flatpak Runtime
Classification: Developer tools
Component: general (other bugs)
Version First Reported In: unspecified
Platform: Arch Linux Linux
: NOR normal
Target Milestone: ---
Assignee: Aleix Pol
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-09-27 00:30 UTC by eff3ctsb0t
Modified: 2025-09-27 01:00 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:

Attachments
A demonstration of this bug. (506.29 KB, video/mp4)
2025-09-27 00:30 UTC, eff3ctsb0t 		Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description eff3ctsb0t 2025-09-27 00:30:46 UTC 
Created attachment 185310 [details]
A demonstration of this bug.

SUMMARY
Flatpak applications using Qt as their toolkit have their popup menus constrained to the left half of the screen when using fractional scaling on Hyprland or Sway. As an example, right-clicking on the right side of OBS's window causes the popup menu to appear in the middle of the screen instead of directly next to the cursor. I was also able to reproduce this issue with Shotcut (Qt 6.8.3), KeePassXC (Qt 5.15.15) and Vorta (Qt 6.9).

STEPS TO REPRODUCE
1. Install OBS via Flatpak
2. Set Hyprland's or Sway's scaling to a fractional value
3. Open OBS, then right-click on the right side of its window

OBSERVED RESULT
The popup menu appears in the middle of the screen.

EXPECTED RESULT
The popup menu appears directly next to the cursor.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux, Kernel 6.16.8.arch3-1
KDE Plasma Version: ---
KDE Frameworks Version: ---
Qt Version: 5.15.15 - 6.9

ADDITIONAL INFORMATION
This issue does not occur with natively installed Qt applications or when their Flatpak variants are run under Xwayland.