Fix for issue 4142: Let show() exit the run loop after all windows are closed in a non-interactive session #4144
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See issue 4142. Currently show() does not exit after all windows have been closed. The relevant code was in src/_macosx.m, but was inadvertently lost in pull request 4006. This bug fix checks the number of windows remaining after closing one window, and calls [NSApp stop: self] if there are no more windows.
One open question is how Python show respond to keyboard interrupts (ctrl-c) while show() is running. Currently ctrl-c does nothing (other than printing ctrl-c to the screen). I guess it would make sense for ctrl-c to cause show() to exit.