### 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_HINT) {
			ItemHint *hint = static_cast<ItemHint *>(item);
			if (r_description) {
				*r_description = hint->description;
			}
			return true;
		}
		item = item->parent;
	}
	return false;
}
Color RichTextLabel::_find_bgcolor(Item *p_item) {
	Item *item = p_item;
	while (item) {
		if (item->type == ITEM_BGCOLOR) {
			ItemBGColor *color = static_cast<ItemBGColor *>(item);
			return color->color;
		}
		item = item->parent;
	}
	return Color(0, 0, 0, 0);
}
Color RichTextLabel::_find_fgcolor(Item *p_item) {