Selection visual at end of the line inconsistent

[aXu-AP]

Godot version

v4.0.beta.custom_build [3a25148], v3.5.1.stable.official [6fed1ff]

System information

Windows 10

Issue description

Visuals for selected text in code editor has 2 flaws in it's logic. I think they're linked so this issue covers both (but I can split it into 2 separate issues if that's better).
First: If selection ends at empty line, carriage return after the cursor is shown as selected:

Above: Godot script editor, below: VS Code

Second: Carriage return at the end of selected lines is not shown (notice ambiguity - what happens if I press delete?):

Above: Godot script editor, below: VS Code

The behaviour seems to be consistent across other editors - I've tested on VS Code, Visual Studio and Notepad++

Steps to reproduce

Open script editor and select text.

Minimal reproduction project

N/A