### Godot version

master ([06ccbfe](https://github.com/godotengine/godot/commit/06ccbfe8eec6e840db3df2360dc2804386f940b8))

### System information

PopOS 22.04

### Issue description

Sometimes the doc page is broken when the engine is closed and then restarted.
Closing the doc and opening it again fixes it.

![2023-05-27_22-15](https://github.com/godotengine/godot/assets/3624853/ed202a55-03e8-420a-bc1c-ccfc7f7cd02a)


### Steps to reproduce

- Open a documentation page for any node
- Restart Godot

### Minimal reproduction project

NA

EDIT : Added the commit hash @Calinou 
selection.active = false;
	queue_redraw();
}
void RichTextLabel::selection_copy() {
	String txt = get_selected_text();
	if (!txt.is_empty()) {
		DisplayServer::get_singleton()->clipboard_set(txt);
	}
}
void RichTextLabel::select_all() {
	if (!selection.enabled) {
		return;
	}
	Item *it = main;
	Item *from_item = nullptr;
	Item *to_item = nullptr;
	while (it) {
		if (it->type != ITEM_FRAME) {
			if (!from_item) {
				from_item = it;
			} else {
				to_item = it;
			}