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 |
| ------ | ------ |
|  |  |
issue