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Backport PRmatplotlib#16330: Clearer signal handling

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Lines changed: 3 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -1043,11 +1043,12 @@ def trigger_manager_draw(manager):`
`1043`	`1043`	`defmainloop():`
`1044`	`1044`	`old_signal=signal.getsignal(signal.SIGINT)`
`1045`	`1045`	`# allow SIGINT exceptions to close the plot window.`
`1046`		`-ifold_signal:`
	`1046`	`+is_python_signal_handler=old_signalisnotNone`
	`1047`	`+ifis_python_signal_handler:`
`1047`	`1048`	`signal.signal(signal.SIGINT,signal.SIG_DFL)`
`1048`	`1049`	`try:`
`1049`	`1050`	`qApp.exec_()`
`1050`	`1051`	`finally:`
`1051`	`1052`	`# reset the SIGINT exception handler`
`1052`		`-ifold_signal:`
	`1053`	`+ifis_python_signal_handler:`
`1053`	`1054`	`signal.signal(signal.SIGINT,old_signal)`

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