Fixed terminal resize and scroll layout issues, improved utility area toggle animation

[austincondiff]

Description

When the terminal was resized, it displayed partial lines at the bottom due to a remainder in the line height multiple. This caused two things:

1. Resizing the Utility Area drawer caused a visual stutter in the terminal.
2. Partial lines at the bottom created an unsightly visual artifact.

The terminal height must now be a multiple of a single line’s height to resolve these issues.

Utility area drawer now has a push/pull animation rather than a reveal.

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

Before

codeedit-terminal-height-fix-before-resize-scroll.mov

codeedit-terminal-height-fix-before-resize.mov

After

codeedit-terminal-height-fix-after.mov

VS Code handles this in a similar way

vscode-terminal-height-resize.mov

Improved utility area animation

Screen.Recording.2024-08-10.at.12.44.40.AM.mov

Note

I removed the maximize drawer toggle in favor of simply dragging to resize up. This simplifies things greatly.

[tom-ludwig]

Just one little thing, and it’s good to go!

[austincondiff]

It might be nice to fix the terminal to the top (how it was before) if the scroll position is at the very top. This way the terminal contents are both aligned to the top and when the utility area drawer is resized, the terminal content follows it smoothly. I am not sure how to grab the terminal scroll position we'd need in order to do this though.