### Godot version

v4.1.stable.official [970459615]

### System information

Godot v4.1.stable - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce MX330 (NVIDIA; 30.0.15.1169) - 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz (8 Threads)

### Issue description

Calling `RichTextLabel`'s `select_all` method has no visual indicator, but it must have one. 

### Steps to reproduce

- Add `RichTextLabel` node
- Set `selection_enabled` value to be `true`
- Call `$RichTextLabel.select_all() `method in `_ready`

### Minimal reproduction project

[RichTextLabel_bug.zip](https://github.com/godotengine/godot/files/12098913/RichTextLabel_bug.zip)

if (st_parser != p_parser) {
		_stop_thread();
		st_parser = p_parser;
		main->first_invalid_line.store(0); 
		_validate_line_caches();
		queue_redraw();
	}
}
TextServer::StructuredTextParser RichTextLabel::get_structured_text_bidi_override() const {
	return st_parser;
}
void RichTextLabel::set_structured_text_bidi_override_options(Array p_args) {
	if (st_args != p_args) {
		_stop_thread();
		st_args = p_args;
		main->first_invalid_line.store(0); 
		_validate_line_caches();
		queue_redraw();
	}
}
Array RichTextLabel::get_structured_text_bidi_override_options() const {