### 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)

_stop_thread();
	MutexLock data_lock(data_mutex);
	current = main;
	current_frame = main;
}
void RichTextLabel::clear() {
	_stop_thread();
	MutexLock data_lock(data_mutex);
	main->_clear_children();
	current = main;
	current_frame = main;
	main->lines.clear();
	main->lines.resize(1);
	main->first_invalid_line.store(0);
	selection.click_frame = nullptr;
	selection.click_item = nullptr;
	deselect();
	current_idx = 1;
	current_char_ofs = 0;
	if (scroll_follow) {
		scroll_following = true;
	}
	if (fit_content) {
		update_minimum_size();
	}
}
void RichTextLabel::set_tab_size(int p_spaces) {