### 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)

menu->popup();
			grab_focus();
		}
	}
	Ref<InputEventPanGesture> pan_gesture = p_event;
	if (pan_gesture.is_valid()) {
		if (scroll_active) {
			vscroll->set_value(vscroll->get_value() + vscroll->get_page() * pan_gesture->get_delta().y * 0.5 / 8);
		}
		return;
	}
	Ref<InputEventKey> k = p_event;
	if (k.is_valid()) {
		if (k->is_pressed()) {
			bool handled = false;
			if (k->is_action("ui_page_up", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() - vscroll->get_page());
				handled = true;
			}
			if (k->is_action("ui_page_down", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() + vscroll->get_page());
				handled = true;
			}
			if (k->is_action("ui_up", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() - theme_cache.normal_font->get_height(theme_cache.normal_font_size));
				handled = true;
			}
			if (k->is_action("ui_down", true) && vscroll->is_visible_in_tree()) {
				vscroll->set_value(vscroll->get_value() + theme_cache.normal_font->get_height(theme_cache.normal_font_size));
				handled = true;