On 30 Nov 2015, at 10:08 AM, Ben Kennedy <b...@zygoat.ca> wrote:
> 
> Either I was not aware of or had forgotten about that setting, but 
> regardless, it's already turned on.

Then your claim that "there is no way to undo this damage" is incorrect. Open 
an image in Preview, crop it, and quit. Open it again and you'll see the 
document is marked dirty/Edited, and you can get back to the original either by 
clicking the close button and Revert Changes, or choosing File -> Revert 
Changes...

-- 
Shane Stanley <sstan...@myriad-com.com.au>
<www.macosxautomation.com/applescript/apps/>


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