### 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)

Item *item = p_item;
	while (item) {
		if (item->type == ITEM_DROPCAP) {
			return static_cast<ItemDropcap *>(item);
		}
		item = item->parent;
	}
	return nullptr;
}
RichTextLabel::ItemList *RichTextLabel::_find_list_item(Item *p_item) {
	Item *item = p_item;
	while (item) {
		if (item->type == ITEM_LIST) {
			return static_cast<ItemList *>(item);
		}
		item = item->parent;
	}
	return nullptr;
}
int RichTextLabel::_find_list(Item *p_item, Vector<int> &r_index, Vector<ItemList *> &r_list) {