Bugfix: Rebasing the head ref

Only use the ref being rebased onto otherwise git will create a detached HEAD.

Author: brotherbard

PBGitHistoryController.m

@@ -671,10 +671,8 @@ - (IBAction) cherryPick:(id)sender
 
 - (IBAction) rebase:(id)sender
 {
-	if (selectedCommit) {
-		PBGitRef *headRef = [[repository headRef] ref];
-		[repository rebaseBranch:headRef onRefish:selectedCommit];
-	}
+	if (selectedCommit)
+		[repository rebaseBranch:nil onRefish:selectedCommit];
 }
 
 #pragma mark -

PBRefController.m

@@ -147,9 +147,8 @@ - (void) cherryPick:(PBRefMenuItem *)sender
 - (void) rebaseHeadBranch:(PBRefMenuItem *)sender
 {
 	id <PBGitRefish> refish = [sender refish];
-	PBGitRef *headRef = [[historyController.repository headRef] ref];
 
-	[historyController.repository rebaseBranch:headRef onRefish:refish];
+	[historyController.repository rebaseBranch:nil onRefish:refish];
 }