Add select, get_character_rect and hit_test to RichTextLabel

[skysphr]

This adds three functions to RichTextLabel, addressing godotengine/godot-proposals#5517, godotengine/godot-proposals#5518, and godotengine/godot-proposals#5519, along with the related godotengine/godot-proposals#1559.

This should make it possible to create a RichTextEditor without further extending the engine, which I will attempt to exemplify in the following days.

I used the name hit_test in order to be consistent with TextServer, TextLine and TextParagraph's nomenclature, although I would have personally picked a more descriptive name such as get_character_at_position, which is similar to what was suggested in the linked proposal.

Production edit:

• Closes implement RichTextEdit's select(from,to) godot-proposals#5517
• Closes Implement RichTextLabel's get_position_at_character(index) godot-proposals#5518
• Closes Implement RichTextLabel's get_character_index_at_pos(pos:Vector2) godot-proposals#5519
• Closes RichTextLabel: Add ability to get col/row position at mouse or arbitrary point godot-proposals#1559

[skysphr]

As it turns out, my original implementation for this was rather terrible. Several tests and fixes later I believe I finally have it corrected. Apologies for submitting poor code.

[Mickeon]

This looks desirable.

As it turns out, my original implementation for this was rather terrible. Several tests and fixes later I believe I finally have it corrected. Apologies for submitting poor code.

It's okay we're all collectively doomed to poor coding practices.

[Mickeon]

Suggested change

	// Find paragraph
	// Find paragraph.

[Mickeon]

Suggested change

	// Handle tables
	// Handle tables.

[Mickeon]

Explicit may be good here

Suggested change

	bool outside;
	bool outside = false;

[Mickeon]

Something is exceptionally off about this line but I can't quite put my finger on it.

[Mickeon]

I assume it means this?
I believe it's a good idea to say "index" here, even if it is often called "position" in Strings. It's reasonably confusing in 2D space where position is a Vector2.

Suggested change

	Returns caret character offset at the specified coordinates.
	Returns the character index at the given position in local space.

[Mickeon]

Suggested change

	Returns the bounding box of the character position provided.
	[b]Note:[/b] If [member threaded] is enabled, this method returns a value for the loaded part of the document. Use [method is_ready] or [signal finished] to determine whether document is fully loaded.
	Returns the bounding box for the character at the given index.
	[b]Note:[/b] If [member threaded] is set to [code]true[/code], this method returns a value for the loaded part of the document. If you need to make sure the document is fully loaded, use [method is_ready] or the [signal finished] signal.

[Mickeon]

Suggested change

	Selects characters between [param from] and [param to].
	If [member selection_enabled] is [code]false[/code], no selection will occur.
	Selects the characters between the [param from] and [param to] positions. Does nothing if [member selection_enabled] is [code]false[/code].

[mthwJsmith]

Not sure if it is intended, but the first character is both at position 1 and 0 from my testing. 0 prints the same bounding box as 1. So in "hello", get_character_rect(0) and get_character_rect(1) both print the bounding box of the "h".

It also doesnt return the appropriate bounding boxes if [dropcap] or [font-size=] is used to change certain words, it ignores that these have changed the characters size. Will this be fixed by #92461 ?

edit: also misclicked approve changes and not sure how to undo that, sorry about that.