Merge request header flickering
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Problem
Reported by @francoisrose
I noticed the MR header can start blinking super fast when scrolling past the title. It's a very narrow increment to make it happen, but it's happened to me a few times this week already
Screen_Recording_2025-11-26_at_11.26.46
Investigation
We suspected that this might be related to #565864 (closed)
Reporter was able to reproduce (inconsistently) Chrome 142.0.7444.176 and MacOS Tahoe 26.0.1
To make it happen I need to scroll to a very specific and narrow position, when I try to recreate it often takes a few attempts to get the right vertical position that triggers it
@trevorpierce looked into the problem briefly but was not able to reproduce but suspected that it could be a page zoom issue "screen zoom rate? Is it a percentage ending in 0 or 5? I feel like we might be in a situation where the browser is splitting a pixel and trying to decide how to render". However reporter had 100% zoom on 4K screenset to 1920x1080 display.
This issue is open to see if there are other reports but may be closed if cannot be reproduced.
Severity is rated at severity4 due to the challenge to reproduce this bug so suspect low number of users will encounter this