### 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)

const_cast<RichTextLabel *>(this)->_validate_line_caches();
	if (updating.load()) {
		return false;
	}
	return (main->first_invalid_line.load() == (int)main->lines.size() && main->first_resized_line.load() == (int)main->lines.size() && main->first_invalid_font_line.load() == (int)main->lines.size());
}
bool RichTextLabel::is_updating() const {
	return updating.load() || validating.load();
}
void RichTextLabel::set_threaded(bool p_threaded) {
	if (threaded != p_threaded) {
		_stop_thread();
		threaded = p_threaded;
		queue_redraw();
	}
}
bool RichTextLabel::is_threaded() const {
	return threaded;
}
void RichTextLabel::set_progress_bar_delay(int p_delay_ms) {
	progress_delay = p_delay_ms;
}
int RichTextLabel::get_progress_bar_delay() const {
	return progress_delay;
}
_FORCE_INLINE_ float RichTextLabel::_update_scroll_exceeds(float p_total_height, float p_ctrl_height, float p_width, int p_idx, float p_old_scroll, float p_text_rect_height) {