[3.8] bpo-43406: Fix test_signal.test_stress_modifying_handlers() (GH-24815) #24816
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Fix a race condition of test_stress_modifying_handlers() of
test_signal: only raise signals while we are in the
catch_unraisable_exception() context manager.
Moreover, don't check if we received at least one
signal if at least one signal got ignored.
(cherry picked from commit 1fa17e8)
Co-authored-by: Victor Stinner vstinner@python.org
https://bugs.python.org/issue43406