concurrent.futures.Future.add_done_callback: calling thread description error.

[nanoric]

asyncio.run_coroutine_threadsafe will return a concurrent.futures.Future.
And according to its doc concurrent.futures.Future.add_done_callback() :

Added callables are called in the order that they were added and are always ** called in a thread belonging to the process that added them. **

But acually, the callback is called in where Future.set_result() is called according to its source.

Linked PRs

• gh-122676: Fix incorrect description in concurrent.futures.Future.add_done_callback #122678