await on completed tasks, instead of calling .result()

gui.py

@@ -1858,7 +1858,7 @@ class GUIManager:
             task.cancel()
         if self._close_requested.is_set():
             raise ExitRequest()
-        return next(iter(done)).result()
+        return await next(iter(done))
 
     def prevent_close(self):
         self._close_requested.clear()

utils.py

@@ -46,7 +46,7 @@ async def first_to_complete(coros: abc.Iterable[abc.Coroutine[Any, Any, _T]]) ->
     done, pending = await asyncio.wait(tasks, return_when=asyncio.FIRST_COMPLETED)
     for task in pending:
         task.cancel()
-    return next(iter(done)).result()
+    return await next(iter(done))
 
 
 def chunk(to_chunk: abc.Iterable[_T], chunk_length: int) -> abc.Generator[list[_T], None, None]: