Hi all, 

For many years now, the default behavior of macOS is to automatically save 
changes the user makes to a document in most native apps.  
This behavior can be turned off by checking “Ask to keep changes when closing 
documents” in the General tab of the System Preferences.  

I have this box checked, because I normally prefer to be in charge over whether 
or not I want to save changes.  
However, there are some apps where it actually makes sense to auto save 
changes, Skim being among them.  There’s not a lot that can go wrong with 
annotating a PDF,  specially because Skim doesn’t actually change the pdfs as 
it writes annotations to the extended attributes—which I still consider to be 
the best feature of Skim.  Preview still frequently screws up the text encoding 
of PDFs when modifying them, even with such a benign thing such as a highlight. 
 

So here’s my conundrum:  Because of apps like Preview I would not want to 
change the setting in the System Preferences to stay in control over what to 
save. 
But I also would love for Skim to just automatically save my changes when 
closing a file.  
I know that there are some applications that in their own preferences allow the 
user to override the setting in the System Prefs.  
Is there maybe a hidden preference that I’m not aware of?   
Or is there maybe a way in macOS to turn off the default behavior for specific 
apps?  

Thanks!  

Jan

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