Merge branch 'en/rebase-against-rebase-fix'

* en/rebase-against-rebase-fix:
  pull --rebase: Avoid spurious conflicts and reapplying unnecessary patches
  t5520-pull: Add testcases showing spurious conflicts from git pull --rebase

git-pull.sh

@@ -273,6 +273,15 @@ then
 	exit
 fi
 
+if test true = "$rebase"
+then
+	o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
+	if test "$oldremoteref" = "$o"
+	then
+		unset oldremoteref
+	fi
+fi
+
 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 case "$rebase" in
 true)