Improve command navigation behavior

[Tyriar]

Fixes #145241

Summary:

• All scroll/select now use 1/4 down the viewport instead of some top some middle
• Scrolling no longer happens if the target line is within the viewport

Combined with #145245, looks like:

[Tyriar]

I wonder if we should set the width of the outline based on the command text instead of spanning the full width?

This was my original plan but I think the main thing that would do is draw less attention to it

Also what does this look like if you have a multi line command?

Not that great 🙂, an improvement we could do later. Getting exact bounds of the command isn't super reliable right now, especially on Windows as well.