Sort events by ReadOrder (if both layer and start time are equal).

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19912 b3059339-0415-0410-9bf9-f77b7e298cf2

libass/ass_render.c

@@ -1914,6 +1914,10 @@ static int cmp_event_layer(const void* p1, const void* p2)
 		return -1;
 	if (e1->Start > e2->Start)
 		return 1;
+	if (e1->ReadOrder < e2->ReadOrder)
+		return -1;
+	if (e1->ReadOrder > e2->ReadOrder)
+		return 1;
 	return 0;
 }