Merge request sidebar is does not stay fixed align to top when bottom of page reached
## Issue When you scroll down to the bottom of the page, the right sidebar on the merge request page does not stay fixed aligned to the top, it scrolls up a bit. As a result, the sidebar moves when inputs into the comment box which causes the comment box to grow vertically. | Bug in scrolling | Culprit: Sidebar does not stay fixed when reached near bottom | | ------ | ------ | | ![Screen_Recording_2025-11-18_at_4.58.20_PM](/uploads/9096af91d2e1d9ba6b8ebf658782538e/Screen_Recording_2025-11-18_at_4.58.20_PM.mov) | ![CleanShot_2025-11-18_at_22.20.35](/uploads/d8edb7543bc2373c8cf0c3c7aedb9037/CleanShot_2025-11-18_at_22.20.35.mp4) |
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