Remove insets from scroll view

[danielzsh]

Description

Before: see CodeEditApp/CodeEdit#1700
After:

Screen.Recording.2024-05-02.at.10.57.08.PM.mov

Related Issues

• Closes 🐞 Line highlights erroneously affected by Utility Area CodeEdit#1700
• Closes 🐞 Selection highlight overflow is drawn just above bottom viewport edge #7

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

[danielzsh]

Oh shoot, just realized the line numbers are now bleeding over the edge...will see what I can about that 😓

[danielzsh]

@austincondiff sorry I'm really new to Swift and am probably missing a really easy way to fix this issue; any pointers? I think the issue stems from the fact that gutterView is added via addFloatingSubview, which causes it to display over the horizontal scrollbar, but I can't figure out how to get it to display under.

[austincondiff]

It looks like the line numbers are fine. The text and selection don't come down far enough though.

@thecoolwinter any thoughts on this?

[danielzsh]

By the way, should we potentially hide the horizontal scrollbar if there's nothing to scroll horizontally/if word wrapping is turned on?

sorry, misclicked.

[austincondiff]

Oh, I see. The line numbers are overlapping the horizontal scrollbar. Two things need to happen here:

1. Line numbers / gutter should stop at the horizontal scrollbar if it is displayed.
2. If there is not horizontal overflow, horizontal scrollbar should be hidden.