`asyncio.print_call_graph()` shows no waiter for `wait_for(fut, 0)`

[deadlovelll]

Bug report

Bug description:

wait_for() with a non-positive timeout does not register an awaited-by edge on the future it waits on

Repro:

import asyncio

async def worker():
    try:
        await asyncio.sleep(10)
    finally:
        await asyncio.sleep(10)

async def probe(t):
    await asyncio.wait_for(t, 0)

async def main():
    t = asyncio.ensure_future(worker())
    p = asyncio.create_task(probe(t))
    await asyncio.sleep(0.1)
    print(asyncio.format_call_graph(t))
    p.cancel()
    t.cancel()

asyncio.run(main())

Actual:

* Task(name='Task-2', id=0x102cb8b90)
  + Call stack:
  |   File '/Users/timofeiivankov/cpython/Lib/asyncio/tasks.py', line 707, in async sleep()
  |   File '/Users/timofeiivankov/cpython/repro.py', line 7, in async worker()

Expected:

* Task(name='Task-2', id=0x101c0cb90)
  + Call stack:
  |   File '/Users/timofeiivankov/cpython/Lib/asyncio/tasks.py', line 714, in async sleep()
  |   File '/Users/timofeiivankov/cpython/repro.py', line 7, in async worker()
  + Awaited by:
    * Task(name='Task-3', id=0x1019890a0)
      + Call stack:
      |   File '/Users/timofeiivankov/cpython/Lib/asyncio/tasks.py', line 553, in async _cancel_and_wait()
      |   File '/Users/timofeiivankov/cpython/Lib/asyncio/tasks.py', line 479, in async wait_for()
      |   File '/Users/timofeiivankov/cpython/repro.py', line 10, in async probe()

Proposed fix: register the edge in _cancel_and_wait()

I have a fix ready

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-157058: Fix missing awaited-by edge in wait_for(fut, 0) #157059