Settings section: Fix border appearing on retina like displays

Sascha Eggenbergerrequested to merge
settings-section-sticky-header-retina-fix into master

What does this MR do and why?

Settings section: Fix border appearing on retina like displays

Fixes an issue with half pixel rendering which lets the sticky bottom border leak through even if it's not sticky.

Thanks for reporting @justin_ho

Screenshots or screen recordings

Before After
before after
before2 after2

How to set up and validate locally

  1. Note: Test on a retina-like device like a MacBook
  2. Go to https://gdk.test:3000/root/pages/-/hooks and there shouldn't be any visible borders
  3. Go to https://gdk.test:3000/root/pages/-/settings/merge_requests to verify the sticky behavior still works as intended

MR acceptance checklist

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Edited by Sascha Eggenberger

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