Bug 515576 - Qt6: Resizing the canvas widget sometimes flickers
Summary: Qt6: Resizing the canvas widget sometimes flickers
Status: REPORTED
Alias: None
Product: krita
Classification: Applications
Component: OpenGL Canvas (other bugs)
Version First Reported In: 6.0.0-beta1
Platform: macOS (DMG) macOS
: NOR normal
Target Milestone: ---
Assignee: Krita Bugs
URL:
Keywords: regression
Depends on:
Blocks:
 
Reported: 2026-02-05 21:33 UTC by Freya Lupen
Modified: 2026-02-05 21:33 UTC (History)
0 users

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

Attachments
Flickering on canvas widget resize (188.43 KB, video/mp4)
2026-02-05 21:33 UTC, Freya Lupen 		Details
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Description Freya Lupen 2026-02-05 21:33:34 UTC 
Created attachment 189257 [details]
Flickering on canvas widget resize

SUMMARY
When resizing the canvas widget (such as by resizing a docker), sometimes a frame or two of the image on canvas disappears (while leaving the canvas background visible), causing flickering.

It happens when canvas graphics acceleration is on. I don't know whether it happens on platforms other than macOS.

This doesn't happen on Qt5.

STEPS TO REPRODUCE
1. Open a document.
2. Resize a docker so that the canvas widget resizes, watch for flickering.

OBSERVED RESULT
Random missing frame of the image

EXPECTED RESULT
Normal image frames 

SOFTWARE/OS VERSIONS
Krita 6.0.0-beta1
macOS Sequoia

ADDITIONAL INFORMATION
See attached video at around :02, :04, :06.