_PostMessage() was holding the BLooperList lock while calling

BMessenger::SendMessage(), which could lead to deadlocks (as in bug
#1745).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23865 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/app/Looper.cpp

@@ -829,6 +829,7 @@ BLooper::_PostMessage(BMessage *msg, BHandler *handler,
 
 	status_t status;
 	BMessenger messenger(handler, this, &status);
+	listLocker.Unlock();
 	if (status == B_OK)
 		status = messenger.SendMessage(msg, replyTo, 0);