Louie, please don't revert header corrections made by a core developer.

I see no mention of binding to press versus release in the original query issue: #27380.  Since the original query code is an edited version of previous code, I suspect I left the binding as it was.  The current subclasses are used with ConfigDialog, where it may not make much difference.  In any case, we will make changes somewhere to fix the problem: change the base class, move the binding in the subclass, or bind "def catch_return(event): return 'break'" to return release.

Unfinished issue #27621 is about refining details of Query button behavior, especially focus, in a cross-platform manner.  I would like for us both to at least review the remaining issues there before doing this one.