Merge branch 'maint-1.7.11' into maint

* maint-1.7.11:
  Almost 1.7.11.6
  gitweb: URL-decode $my_url/$my_uri when stripping PATH_INFO
  rebase -i: use full onto sha1 in reflog
  sh-setup: protect from exported IFS
  receive-pack: do not leak output from auto-gc to standard output
  t/t5400: demonstrate breakage caused by informational message from prune
  setup: clarify error messages for file/revisions ambiguity
  send-email: improve RFC2047 quote parsing
  fsck: detect null sha1 in tree entries
  do not write null sha1s to on-disk index
  diff: do not use null sha1 as a sentinel value

git-rebase--interactive.sh

@@ -569,11 +569,10 @@ do_next () {
 	test -s "$todo" && return
 
 	comment_for_reflog finish &&
-	shortonto=$(git rev-parse --short $onto) &&
 	newhead=$(git rev-parse HEAD) &&
 	case $head_name in
 	refs/*)
-		message="$GIT_REFLOG_ACTION: $head_name onto $shortonto" &&
+		message="$GIT_REFLOG_ACTION: $head_name onto $onto" &&
 		git update-ref -m "$message" $head_name $newhead $orig_head &&
 		git symbolic-ref \
 		  -m "$GIT_REFLOG_ACTION: returning to $head_name" \