Thanks, mmalc. That little sheet looked so simple it didn't occur to
me that there would be a whole chapter of documentation on it,
including what I needed...
"Control-click ^empty^space^ in the line of the criteria".
Now that's what I call a hidden feature!
I'm that if I file a bug asking the Xcode folks to add a button or
something to un-hide this feature, it would be marked as a Duplicate,
but if anyone thinks I should file a bug, I shall.
*****
Speaking of duplicates ... As I expected when I saw the word "fetch",
the method of finding duplicates which I described in my original
post, using a fetched property, is quite slow.
I reckon that finding all duplicates in a set of N objects requires
N*(N-1)/2 comparisons. I tried this on a test data set I have of 1200
objects containing just a few actual duplicates. Doing it in code
took 750 milliseconds. Asking for the 'dupes' fetched property as
described in my original post, for each object, took 100 times longer,
75 seconds.
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