[Bug 4226] New: Confusing order of operations in revsets

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4226

          Priority: normal
            Bug ID: 4226
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: Confusing order of operations in revsets
          Severity: bug
    Classification: Unclassified
                OS: Mac OS
          Reporter: joshgold at alum.mit.edu
          Hardware: Macintosh
            Status: UNCONFIRMED
           Version: 2.9.1
         Component: Mercurial
           Product: Mercurial

If you specify a revset like this:
  set1 + set2 - set3
It is interpreted as
  set1 + (set2 - set3)
I expected (set1 + set2) - set3.

I think many would find this confusing.  I think it should probably be changed
so that + and - are the same priority.  

In either case (change to implementation or not) it would be helpful if order
of operations is documented under "help revsets".

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