Fix Overlapping Lines Method

[thecoolwinter]

Description

Fixes the getHighlightedLines method to get the text line instead of the visible line. This difference was pointed out in #259 when @Bogdan-Belogurov pointed out that a selection would select the line it ended on instead of the lines it contained.

This fix matches other editor's behavior, where selecting a line including the newline does not include the next line when applying a transformation.

Xcode example

An example is Xcode when indenting a selected line, note that the selection includes the newline character, but does not move the next line. Right now, CodeEdit moves the next line too.

Screen.Recording.2025-05-30.at.10.59.43.AM.mov

Related Issues

• ✨ Move selected lines up and down #259

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

Screen.Recording.2025-05-30.at.11.00.36.AM.mov

[austincondiff]

Looks good! It's nicely documented and written. No issues that I can see.