[Bug 5133] New: subpaths substitution in .hgsub done twice

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=5133

            Bug ID: 5133
           Summary: subpaths substitution in .hgsub done twice
           Product: Mercurial
           Version: 3.1.2
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: bjorn.furugard at gmail.com
                CC: mercurial-devel at selenic.com

When using subpaths regex substitution in .hgsub, substitution is done twice
for each path when trying to push to central location.
To reproduce:
Create repo A with subrepos B and C.

.hgsub in A:
B = B
C = C
[subpaths]
^(.*)/([^/]*)/([^/]*)$ = \1/\3

The subpaths in this example will remove the A in the path to flatten the
destination directory structure (see
https://www.mercurial-scm.org/wiki/Subrepository#Use_.27trivial.27_subrepo_paths_where_possible
for a similar example)

Commit all repositories and push to a central location (where the repository
structure is flat, that is A, B and C repositories are in the same directory).

Expected outcome:
All repositories will be successfully pushed.

Probable outcome:
pushing to /my/central/location/a
pushing subrepo B to /my/central/b
abort: repository /my/central/b not found!

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