I often round up photos to work on using the library filter or a smart collection. Unfortunately, as soon as I start working on them, they often disappear - you know what I'm talking about, right? (criteria that was holding the photo(s) gets cleared).
How about a lock button, such that the contents of the filtered list or smart collection won't change until unlocked.
(at a minimum, add "Empty Collection" to context menu, since my present workaround is to copy from smart collection to dumb (temp/to-do) collection. But, I often want to clear the to-do collection for a new round, without selecting it and thus losing my present selection...)
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