convert: handle past or foreign partial svn copies
Subversion allows revisions to be composed of subparts coming from revisions
before the parent or from other part of the repository. There is no simple
representation for these now, keep the changes but do not track their origins.
Checked out revision 0.
A a
Adding a
Transmitting file data .
Committed revision 1.
% initial roundtrip
scanning source...
sorting...
converting...
0 added a
scanning source...
sorting...
converting...
% second roundtrip should do nothing
scanning source...
sorting...
converting...
scanning source...
sorting...
converting...
% new hg rev
updating working directory
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
% echo hg to svn
scanning source...
sorting...
converting...
0 b
% svn back to hg should do nothing
scanning source...
sorting...
converting...
% hg back to svn should do nothing
scanning source...
sorting...
converting...