crecord: exit edition of hunk with non-zero status does not interrupt session

Before this patch, when editing a hunk, if the editor was exiting with a non-
zero status the crecord session would be aborted. This patch makes crecord
handle the failure and goes back to the state before the failed edition.
We use the new error reporting mechanism introduced in the previous patch to
notify the user of the issue.

mercurial/crecord.py

@@ -1468,9 +1468,11 b' are you sure you want to review/edit and'
                 f.close()
                 # start the editor and wait for it to complete
                 editor = self.ui.geteditor()
-                self.ui.system("%s \"%s\"" % (editor, patchfn),
-                          environ={'hguser': self.ui.username()},
-                          onerr=util.Abort, errprefix=_("edit failed"))
+                ret = self.ui.system("%s \"%s\"" % (editor, patchfn),
+                          environ={'hguser': self.ui.username()})
+                if ret != 0:
+                    self.errorstr = "Editor exited with status %d" % ret
+                    return None
                 # remove comment lines
                 patchfp = open(patchfn)
                 ncpatchfp = cStringIO.StringIO()
@@ -1495,6 +1497,10 b' are you sure you want to review/edit and'
 
         beforeadded, beforeremoved = item.added, item.removed
         newpatches = editpatchwitheditor(self, item)
+        if newpatches is None:
+            if not test:
+                updateui(self)
+            return
         header = item.header
         editedhunkindex = header.hunks.index(item)
         hunksbefore = header.hunks[:editedhunkindex]

tests/test-commit-interactive-curses.t

@@ -65,14 +65,16 b' Committing only one file'
   a
   a
 
-Committing only one hunk
+Committing only one hunk while aborting edition of hunk
 
 - Untoggle all the hunks, go down to the second file
 - unfold it
 - go down to second hunk (1 for the first hunk, 1 for the first hunkline, 1 for the second hunk, 1 for the second hunklike)
 - toggle the second hunk
+- edit the hunk and quit the editor imediately with non-zero status
 - commit
 
+  $ printf "printf 'editor ran\n'; exit 1" > editor.sh
   $ echo "x" > c
   $ cat b >> c
   $ echo "y" >> c
@@ -86,9 +88,12 b' Committing only one hunk'
   > KEY_DOWN
   > KEY_DOWN
   > TOGGLE
+  > e
   > X
   > EOF
-  $ hg commit -i  -m "one hunk" -d "0 0"
+  $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg commit -i  -m "one hunk" -d "0 0"
+  editor ran
+  $ rm editor.sh
   $ hg tip
   changeset:   2:7d10dfe755a8
   tag:         tip