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Works like a charm!
Though if implementing it in your game I would add a quick pixel_width() to to the input. Just to avoid saves called "WWWWWWWWWWWW" breaking the UI.

in the   screen savegameName(accept=NullAction()):

this line 

        input size 40 color gui.hover_color default store.save_name changed Namer length 22 allow allowedChars:

limits the input length to 22 characters (adjust as required for your use)