[3.13] gh-120221: Support KeyboardInterrupt in asyncio REPL (GH-123795) #123799
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This switches the main pyrepl event loop to always be non-blocking so that it
can listen to incoming interruptions from other threads.
This also resolves invalid display of exceptions from other threads
(gh-123178).
This also fixes freezes with pasting and an active input hook.
(cherry picked from commit 033510e)
Co-authored-by: Łukasz Langa lukasz@langa.pl