I like this feature, but just to clarify...I think the new functionality should only come into play
when the Find dialog has focus, rather than merely showing.
Here is a use case that supports this:
I do a "Find all in project". This loads all matches in the find dialog. Then while editing a particular file, I may want to press (⌥⌘F) to select the instances in that file and edit them a certain way, while not losing the matches listed in the dialog for the other files. I may even select a portion of a file and thus (⌥⌘F) should only select the instances within the selection.
Thanks,
Curt