rebase: --abort doesn't strip away the target changeset (issue2220)
When a changeset is skipped, rebase keeps the previous target as next
target and if the skipped cset is the first one, the recorded target is
actually the original target.
--abort did not detect this situation but simply stripped away the cset.
adding a
adding b
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
% Rename is tracked
2:rename A
diff --git a/a b/a-renamed
rename from a
rename to a-renamed
% Rebase the revision containing the rename
% Rename is not lost
2:rename A
diff --git a/a b/a-renamed
rename from a
rename to a-renamed
adding a
adding b
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
created new head
% Copy is tracked
2:copy A
diff --git a/a b/a-copied
copy from a
copy to a-copied
% Rebase the revision containing the copy
% Copy is not lost
2:copy A
diff --git a/a b/a-copied
copy from a
copy to a-copied