[Bug 4039] New: `hg log -r 0:null` is like `hg log -r null`

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4039

          Priority: normal
            Bug ID: 4039
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: `hg log -r 0:null` is like `hg log -r null`
          Severity: bug
    Classification: Unclassified
                OS: Linux
          Reporter: neuhauser+selenic.com at sigpipe.cz
          Hardware: PC
            Status: UNCONFIRMED
           Version: 2.7.1
         Component: Mercurial
           Product: Mercurial

unlike `hg log -r null:0`, which is a set of two revisions.

fixture:

  $ export HGRCPATH="$PWD/hgrc"
  $ cat > "$HGRCPATH" <<EOF
  > [ui]
  > interactive = False
  > logtemplate = "{ifeq(rev, '-1', '(init) ', '{desc|firstline|nonempty}')}
{rev}\n"
  > quiet = True
  > username = J. Random Hacker <hackjr at example.org>
  > [extensions]
  > hgext.graphlog =
  > EOF

  $ hg init
  $ for i in 0 1 2; do
  >   echo c$i > f
  >   hg ci -Am commit-$i f
  > done

  $ hg glog -r tip:null
  @  commit-2 2
  |
  o  commit-1 1
  |
  o  commit-0 0
  |
  o  (init)  -1


one of these is unlike the others:

  $ hg log -r null:null
  (init)  -1

  $ hg log -r null:null
  (init)  -1

  $ hg log -r null:0
  (init)  -1
  commit-0 0

  $ hg log -r 0:null
  (init)  -1

  $ hg log -r null:1
  (init)  -1
  commit-0 0
  commit-1 1

  $ hg log -r 1:null
  commit-1 1
  commit-0 0
  (init)  -1

  $ hg log -r null:2
  (init)  -1
  commit-0 0
  commit-1 1
  commit-2 2

  $ hg log -r 2:null
  commit-2 2
  commit-1 1
  commit-0 0
  (init)  -1

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