Add Text Insets

[thecoolwinter]

Description

• Adds a textInsets property that allows insetting the drawn text further than other drawn content in the view.
  This works in addition to the edgeInsets property, and only effects where text is drawn. This enables adding a padded area where text is not drawn, and selections are not drawn, and further inset the text from that edge.
  This is useful when adding trailing padding to a text view that is not wrapping lines. In a case like that, the textview needs to have a larger width than just the text, but also needs to draw the selection rect in that padded area. To achieve this, the text inset would be set to the padded area.

Related Issues

• Related to 🐞 Selected Line Background Extends Outside Text #59.
• Will facilitate what Adjust Gutter Background, Add Trailing Padding CodeEditSourceEditor#272 attempted to do (the trailing padding) without introducing blank space on the trailing edge.

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

Text insets and edge insets have left and right set to 30. All content is inset by 30px and the text is further inset by another 30px on the right side.

Screen.Recording.2025-01-12.at.1.58.42.PM.mov

An example of negative text insets on top of positive edge insets, showing it works as expected.

Screen.Recording.2025-01-12.at.1.57.42.PM.mov

No wrapping lines, text inset is >0 on the right edge, meaning the textview has some room to scroll after the text, while still drawing the selection rect in some of that padded area.

Screen.Recording.2025-01-12.at.1.59.14.PM.mov

The updated example app with two new controls: