Implement RichTextLabel's get_position_at_character(index)

[CsloudX]

Related to #5513.

Describe the project you are working on

A dictionary app, and I want implement a RichTextEdit extends RichTextLabel, now I was implemented some features.

Describe the problem or limitation you are having in your project

But there was some problem on current RichTextLabel:
I can't draw my flash cursor at correct position because there have not api get a character position, so I neet a get_position_for_character_at(index) api for that

Describe the feature / enhancement and how it helps to overcome the problem or limitation

Implement get_position_for_character_at(index) api.
OR: Implement a RichTextEdit by core, I realy wish it.

I often use GODOT for GUI-application, I realy need a RichTextEdit

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

/

If this enhancement will not be used often, can it be worked around with a few lines of script?

No, I can't!

Is there a reason why this should be core and not an add-on in the asset library?

/

My project:
RichTextEditTest.zip

[markdibarry]

This can be achieved using get_character_line(int character) and get_line_offset(int line). Though you may need to know more about your specific font to get the horizontal offset.