Differences with show() between backends

I was just testing out the examples from the docs and figured I would put some quick findings here while running on a Mac.

• Documentation: Change subplot_module to subplot_mosaic in a couple of places in the code samples
• qt5agg: mg.show() does not exit after closing both figures, the event loop keeps running
• macosx: mg.show() closing one figure closes all of the figures, as if the closeWindow gets sent to every figure, not just the one clicked.
• tkagg: In the second fr.show() call in the examples I get this error: _tkinter.TclError: can't invoke "wm" command: application has been destroyed (macosx seems to get through this and the qt5agg I don't think ever even gets here due to the event loop not quiting after the first show() as mentioned above)

Inizia riproducendo gli esempi documentati su macOS con i backend qt5agg, macosx e tkagg, concentrandoti sul comportamento segnalato di show() e della chiusura delle figure per ciascun caso. Esamina gli esempi che contengono subplot_module e i punti di ingresso show/close specifici del backend menzionati nel report. Il lavoro è completato quando gli esempi usano subplot_mosaic e ogni backend gestisce i casi segnalati di event-loop, chiusura della finestra e seconda chiamata a show() senza gli errori indicati.