### Godot version

4.1.rc.custom_build. c83f912bc

### System information

Ubuntu 22.04 CI

### Issue description

When executing
```
extends Node
func _process(delta):

	var temp_variable35241 = RichTextLabel.new()
	add_child(temp_variable35241)
	temp_variable35241.set_fit_content(true)
	temp_variable35241.parse_bbcode("3188932498")
	temp_variable35241.queue_free()
```
this code freeze project in CI for at least 60 seconds

### Steps to reproduce

Above

### Minimal reproduction project

N/A
for (int i = sr; i < fi; i++) {
			total_height = _resize_line(main, i, theme_cache.normal_font, theme_cache.normal_font_size, text_rect.get_size().width - scroll_w, total_height);
			total_height = _update_scroll_exceeds(total_height, ctrl_height, text_rect.get_size().width - scroll_w, i, old_scroll, text_rect.size.height);
			main->first_resized_line.store(i);
			if (stop_thread.load()) {
				return;
			}
		}
	}
	total_height = (fi == 0) ? 0 : _calculate_line_vertical_offset(main->lines[fi - 1]);
	for (int i = fi; i < (int)main->lines.size(); i++) {
		total_height = _shape_line(main, i, theme_cache.normal_font, theme_cache.normal_font_size, text_rect.get_size().width - scroll_w, total_height, &total_chars);
		total_height = _update_scroll_exceeds(total_height, ctrl_height, text_rect.get_size().width - scroll_w, i, old_scroll, text_rect.size.height);
		main->first_invalid_line.store(i);
		main->first_resized_line.store(i);
		main->first_invalid_font_line.store(i);
		if (stop_thread.load()) {
			return;
		}
		loaded.store(double(i) / double(main->lines.size()));
	}
	main->first_invalid_line.store(main->lines.size());
	main->first_resized_line.store(main->lines.size());
	main->first_invalid_font_line.store(main->lines.size());
	if (fit_content) {
		update_minimum_size();
	}
	emit_signal(SNAME("finished"));
}
void RichTextLabel::_invalidate_current_line(ItemFrame *p_frame) {