Fixed: Tabs not selected in RichTextLabel

[torabshaikh]

Fix #42656

Too fast, missed something.

[akien-mga]

I initially approved but on second thought, I'm afraid that this might have unintended consequences on the use of cw further on, which is not only used for the display of this selection box.

See a bit below in the method where there's some logic which actually handles tabs specifically and increases cw again, so I think this PR might add bugs (I didn't test to confirm):
https://github.com/godotengine/godot/blob/de38ec06fc07f9a76622810536ce054bed5c4295/scene/gui/rich_text_label.cpp#L592-L595

[torabshaikh]

@akien-mga Thanks for pointing out. Will it be alright if I add a different variable just to control the selection box? Please let me know if you can suggest anything else, I also want to declare a new variable just to show the box.

[Paulb23]

Closing as the issue is fixed by #44487. However, feel free to open a PR for 3.x.