I assume that NSDocument's isInViewingMode is what I should be asking if the document being used is an actual opened doc or one in the Versions browser. Looking at TextEdit, its document class has an isReadOnly instance variable, but I don't see it getting set to YES even when browsing versions. Yet somehow the Save menu item gets disabled when a browsed version if the active window. But TextEdit doesn't seem to prevent any actual edits from happening, but instantly undoes each edit. So you see the change for a split second. That's not a very good user experience. What does everyone else do? Disable menu items and disallow edits based solely or in part on the isInViewingMode result? Does isInViewingMode ever return YES for reasons other than for docs being browsed in Versions? What about locked files?
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