`prompt_async` is blocking on windows

Consider the following:

import asyncio

from prompt_toolkit.shortcuts import prompt_async

async def spam():
    while True:
        print("hello");
        await asyncio.sleep(0.1);
        print("World");
        await asyncio.sleep(0.1);


async def my_coroutine():
    while True:
        result = await prompt_async('Say something: ', patch_stdout=True)
        print('You said: %s' % result)

loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.gather(my_coroutine(), spam()))
loop.close()

What I expect to happen: The prompt is pushed down by a continual stream of Hello and World

What actually happens: Each time I push a single character, an extra Hello or World is printed - the output does not advance while waiting for a single character.

[eric-wieser]

eventloop.utils.AsyncioTimeout is also missing, even though 'AsyncioTimeout' in eventloop.utils.__all__.

Are there no automated tests on the 2.0 branch to catch these things?

[BYK]

Tested this with the modernized version of the initial case:

import asyncio
from prompt_toolkit import PromptSession
from prompt_toolkit.patch_stdout import patch_stdout

async def spam():
    while True:
        print("hello");
        await asyncio.sleep(0.1);
        print("World");
        await asyncio.sleep(0.1);


async def my_coroutine():
    session = PromptSession()
    while True:
        with patch_stdout():
            result = await session.prompt_async('Say something: ')
        print('You said: %s' % result)


loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.gather(my_coroutine(), spam()))
loop.close()

Seems to be working as expected (prompt line is continuously pushed down even when typing).