Modal dialogs stops the asyncio event loop about quamash HOT 8 CLOSED

def function modalDialog(dialog):
    future = asyncio.Future()
    dialog.finished.connect(lambda r: future.set_result(r))
    dialog.open()
    return future

dialog = QMessageBox(...)
dialog.setTitle(...)

result = dialog.exec()

result = yield from modalDialog(dialog)

import sys
import itertools
from PyQt5.QtWidgets import QApplication, QMessageBox
import asyncio
import quamash 

def dialog_async_exec(dialog):
    future = asyncio.Future()
    dialog.finished.connect(lambda r: future.set_result(r))
    dialog.open()
    return future

@asyncio.coroutine
def main():
    global app
    dialog = QMessageBox(QMessageBox.Question,
                         "Application Name",
                         "Hardware failure.\n\nDisk error detected\nDo you want to stop?")

    dialog.addButton(QMessageBox.Yes)
    dialog.setDefaultButton(QMessageBox.Yes)
    dialog.addButton(QMessageBox.No)
    dialog.setEscapeButton(QMessageBox.No)
    result = yield from dialog_async_exec(dialog)
    if result == QMessageBox.Yes:
        print('Yes!')
    elif result == QMessageBox.No:
        print('No!')
    else:
        print('Something else')

@asyncio.coroutine
def weirdloop():
    # this keeps looping to prove the loop is still running
    for i in itertools.count():
        print('loop count', i)
        yield from asyncio.sleep(1)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    loop = quamash.QEventLoop(app)
    asyncio.set_event_loop(loop)
    asyncio.async(weirdloop())
    with loop:
        loop.run_until_complete(main())

from quamash import QMessageBox

....

yield from QMessageBox.async_question(self, "Test", "Do I bug ?")

Exception in callback <TaskStepMethWrapper object at 0x7fe51e40c470>()
handle: <Handle <TaskStepMethWrapper object at 0x7fe51e40c470>()>
Traceback (most recent call last):
  File "/usr/lib/python3.6/asyncio/events.py", line 145, in _run
    self._callback(*self._args)
KeyError: <QSelectorEventLoop running=True closed=False debug=False>