1890710 - Screen is flashing while being in the Little Puzzle Game window (https://killedbyapixel.github.io/LittleJS/examples/puzzle/)

Status: VERIFIED FIXED

(Core :: Graphics: Canvas2D, defect)

Description

[Bianca Hidecuti, Desktop Test Engineering [:bhidecuti]]

Attachment: Screen flashing

Found in

• Latest Nightly 126.0a1 (2024-04-10)

Affected versions

• Latest Nightly 126.0a1 (2024-04-10)
• 125.0 RC1
• 124.0.2

Tested platforms

• Affected platforms: Ubuntu 22.04, macOS 12.6.6
• Unaffected platforms: Windows 11

Steps to reproduce

1. Go to https://killedbyapixel.github.io/LittleJS/examples/puzzle/
2. Wait several seconds in the window and observe the puzzle board on the screen

Expected result

• No flashing can be observed on the screen

Actual result

• Screen is randomly flashing

Regression range

• Will perform the regression range ASAP

Additional notes

• See the attached video
• In Firefox ESR 115.10.0 no flashing is present, but a lagging animation can be observed when the puzzle pieces are matched
• On Ubuntu 22.04 the issue appears more frequently than on macOS
• Initially reported in Bug 1880996

Comment 2

[Bianca Hidecuti, Desktop Test Engineering [:bhidecuti]]

I am no longer able to reproduce the issue on Firefox Nightly 128.0a1 (2024-06-05) using macOS 14.4 or Ubuntu 22.04, while following the steps described in Comment 0.
I have searched for the fix using Mozregression and it pointed to Bug 1898436.
Based on the above I am marking this verified as fixed.