### 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)

} else {
		if (p_item->subitems.size() && p_item->type != ITEM_TABLE) {
			return p_item->subitems.front()->get();
		} else if (p_item->type == ITEM_FRAME) {
			return nullptr;
		} else if (p_item->E->next()) {
			return p_item->E->next()->get();
		} else {
			
			while (p_item->type != ITEM_FRAME && !p_item->E->next()) {
				p_item = p_item->parent;
			}
			if (p_item->type != ITEM_FRAME) {
				return p_item->E->next()->get();
			} else {
				return nullptr;
			}
		}
	}
}
RichTextLabel::Item *RichTextLabel::_get_prev_item(Item *p_item, bool p_free) const {
	if (p_free) {
		if (p_item->subitems.size()) {
			return p_item->subitems.back()->get();
		} else if (!p_item->parent) {
			return nullptr;
		} else if (p_item->E->prev()) {
			return p_item->E->prev()->get();
		} else {