Change svn revision to git object id in comment

src/core.py

@@ -230,15 +230,15 @@ def run_queue(fd):
 
 
         # It's possible that a thread is actively enqueuing callbacks faster
-        # than we can dequeue and invoke them.  r3583 tried to fix this by
+        # than we can dequeue and invoke them.  207fc3af77 tried to fix this by
         # locking the queue for the entire loop, but this introduced a
         # deadlock caused when a thread enqueues a callback while a previously
         # queued callback is being invoked and is blocked on a resource used
         # by that thread (like a different mutex).
         #
         # So we don't lock the whole loop to avoid the deadlock, and we stop
         # invoking callbacks after mainthread_callback_max_time seconds
-        # has elapsed in order to solve the problem r3583 tried to fix.
+        # has elapsed in order to solve the problem 207fc3af77 tried to fix.
         #
         # Now, there is a large upper bound on the queue to prevent memory
         # exhaustion, which means a producer will block if it's adding