https://bz.mercurial-scm.org/show_bug.cgi?id=5561

            Bug ID: 5561
           Summary: at least grep and churn need to have linkrevs adjusted
                    in evolve repos
           Product: Mercurial
           Version: 4.2
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzi...@mercurial-scm.org
          Reporter: martinv...@google.com
                CC: mercurial-devel@mercurial-scm.org

cmdutil.walkfilerevs() simply calls filelog.linkrev(j), which does not do
linkrev adjustment to correct for hidden revisions. The result is that at least
grep and churn produce bad results if a linkrev points to a hidden commit.


For example:


Correct result (in a fresh clone):
$ hg churn -r ::4.2 mercurial/manifest.py | head -5
dur...@fb.com                    1315
**************************************************************************
martinv...@google.com            1041
***********************************************************
m...@selenic.com                   477 ***************************
au...@google.com                  428 ************************
r...@durin42.com                   311 ******************


Bad result in my repo:

$ hg churn -r ::4.2 mercurial/manifest.py | head -5
m...@selenic.com                   477
**************************************************************************
martinv...@google.com             434
*******************************************************************
au...@google.com                  372
**********************************************************
dur...@fb.com                     355
*******************************************************
r...@durin42.com                   311
************************************************

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