### 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 (tab_size == p_spaces) {
		return;
	}
	_stop_thread();
	tab_size = p_spaces;
	main->first_resized_line.store(0);
	queue_redraw();
}
int RichTextLabel::get_tab_size() const {
	return tab_size;
}
void RichTextLabel::set_fit_content(bool p_enabled) {
	if (p_enabled == fit_content) {
		return;
	}
	fit_content = p_enabled;
	update_minimum_size();
}
bool RichTextLabel::is_fit_content_enabled() const {
	return fit_content;
}
void RichTextLabel::set_meta_underline(bool p_underline) {
	if (underline_meta == p_underline) {
		return;
	}
	underline_meta = p_underline;
	queue_redraw();
}
bool RichTextLabel::is_meta_underlined() const {