### Godot version

Latest 4.0.dev (a3a42159e31db27f8ae7c1ecad6a9ed417cb05de)

### System information

Ubuntu 22.04.1 LTS

### Issue description

Ctrl+Shift+F (Find in Files) in the text editor, for example, causes my laptop to freeze consistently. I also reproduced it with F1 and Ctrl+Shift+R, as well as by using the dropdown instead of shortcuts.

### Steps to reproduce

Trivial

### Minimal reproduction project

N/A
XFlush(x11_display);
	
	XEvent ev = {};
	while (XCheckIfEvent(x11_display, &ev, _predicate_all_events, nullptr)) {
		
		if (XFilterEvent(&ev, None)) {
			
			
			continue;
		}
		
		
		
		if (ev.type == SelectionRequest) {
			_handle_selection_request_event(&(ev.xselectionrequest));
			continue;
		}
		r_events.push_back(ev);
	}
}
DisplayServer::WindowID DisplayServerX11::window_get_active_popup() const {