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Doh! I wrote a long note, but I'm editing it out here. I was typing "qtractor" in the top-level directory, and bash was executing the one in bin and not the newly edited one in the qtractor directory. Works like a charm.
It only compiles qtractorMainForm.cpp when I change that file. It compiles many more files when I change qtractorAbout.h. I'm thinking it's because many more files depend on that header. That's what was confusing me with respect to the long compilation that I thought was doing the whole thing over again.