Multi carets cannot be deselected

[MarcusElg]

Godot version

4.1

System information

Windows

Issue description

Being able to have multiple cursors similarly to vscode is a great feature, however it's only possible to add carets, not remove them. By left clicking you can remove all extra cursors but you cannot remove a specific one so after selecting multiple lines a single missclick, you have to reselect them all again. Looking at the original pr there was a remove_caret function added so it would make sense to be able to remove carets when clicking again, like in vscode.

Steps to reproduce

• Alt click to add multiple carets
• Alt click on the same position again
• Nothing happens

Minimal reproduction project

N/A