rebase: properly abort when destination is public (issue4896)

rebase: properly abort when destination is public (issue4896)

After rebasing a set of changes onto a public changeset and having the first one
be skipped, if you try to abort, the operation fails. This fix adds a check to
disallow the target rev into the dstates list within the abort function. This
list is checked for immutable states before the rest of abort does its thing.

--- a/hgext/rebase.py	Wed Oct 14 18:03:17 2015 -0500
+++ b/hgext/rebase.py	Tue Oct 13 14:06:51 2015 -0700
@@ -920,7 +920,11 @@
 
     activebookmark: the name of the bookmark that should be active after the
         restore'''
-    dstates = [s for s in state.values() if s >= 0]
+
+    # If the first commits in the rebased set get skipped during the rebase,
+    # their values within the state mapping will be the target rev id. The
+    # dstates list must must not contain the target rev (issue4896)
+    dstates = [s for s in state.values() if s >= 0 and s != target]
     immutable = [d for d in dstates if not repo[d].mutable()]
     cleanup = True
     if immutable:

--- a/tests/test-rebase-abort.t	Wed Oct 14 18:03:17 2015 -0500
+++ b/tests/test-rebase-abort.t	Tue Oct 13 14:06:51 2015 -0700
@@ -318,3 +318,37 @@
   commit: (clean)
   update: 1 new changesets, 2 branch heads (merge)
   phases: 4 draft
+
+test aborting a rebase succeeds after rebasing with skipped commits onto a
+public changeset (issue4896)
+
+  $ hg init succeedonpublic
+  $ cd succeedonpublic
+  $ echo 'content' > root
+  $ hg commit -A -m 'root' -q
+
+set up public branch
+  $ echo 'content' > disappear
+  $ hg commit -A -m 'disappear public' -q
+commit will cause merge conflict on rebase
+  $ echo '' > root
+  $ hg commit -m 'remove content public' -q
+  $ hg phase --public
+
+setup the draft branch that will be rebased onto public commit
+  $ hg up -r 0 -q
+  $ echo 'content' > disappear
+commit will disappear
+  $ hg commit -A -m 'disappear draft' -q
+  $ echo 'addedcontADDEDentadded' > root
+commit will cause merge conflict on rebase
+  $ hg commit -m 'add content draft' -q
+
+  $ hg rebase -d 'public()' --tool :merge -q
+  note: rebase of 3:0682fd3dabf5 created no changes to commit
+  warning: conflicts while merging root! (edit, then use 'hg resolve --mark')
+  unresolved conflicts (see hg resolve, then hg rebase --continue)
+  [1]
+  $ hg rebase --abort
+  rebase aborted
+