Before this change, the editor completion menu and gutter menus reversed their order so that the initial selection is near the user's focus. This change instead displays these menus in a consistent top-to-bottom order because the following benefits outweigh that benefit:
* Matches behavior of some other editors (Neovim and VSCode).
* Looks better for lexicographic lists.
* Keeps the meaning of keyboard interaction consistent, if the user is anticipating the order of the menu's contents.
Could consider making this configurable in the future if desired.
Closes#25066.
Release Notes:
- N/A
7bc62de267