Factor out common parts of qt and macos interrupt handling. #27285
+108
−129
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Note that we don't actually need to disable the QSocketNotifier at the end, just letting it go out of scope should be sufficient as its destructor also does that (see qsocketnotifier.cpp in the qt source tree).
Followup to #27221.
(Also had to rename some local variables named "signal" in the CallbackRegistry implementation; otherwise the style checker complains about shadowing the imported module name... though #26013 would make some of these irrelevant.)Switched to putting the contextmanager in backend_bases.PR summary
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