diffcore-break: allow debugging

Sprinkle a few diff_debug_queue() to allow inspecting what is
going on inside this part of the diffcore chain.

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

diffcore-break.c

@@ -167,6 +167,7 @@ void diffcore_break(int break_score)
 
 	DIFF_QUEUE_CLEAR(&outq);
 
+	diff_debug_queue("begin breaking", q);
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filepair *p = q->queue[i];
 		int score;
@@ -221,6 +222,7 @@ void diffcore_break(int break_score)
 	free(q->queue);
 	*q = outq;
 
+	diff_debug_queue("end breaking", q);
 	return;
 }
 
@@ -267,6 +269,7 @@ void diffcore_merge_broken(void)
 
 	DIFF_QUEUE_CLEAR(&outq);
 
+	diff_debug_queue("begin merge broken", q);
 	for (i = 0; i < q->nr; i++) {
 		struct diff_filepair *p = q->queue[i];
 		if (!p)
@@ -299,6 +302,7 @@ void diffcore_merge_broken(void)
 	}
 	free(q->queue);
 	*q = outq;
+	diff_debug_queue("end merge broken", q);
 
 	return;
 }