grep: hide cryptic revision number by default I believe nobody would want to see the "2147483647:" prefix while grepping working directory files. The wdir revision is still visible if "-r wdir()" is specified since a revset may point to more than one revisions, and it seems confusing to change the visibility dynamically by the number of the matched revisions. Differential Revision: https://phab.mercurial-scm.org/D3920