action: Make sure event retiming really *is* a stable sort...

1 files changed, 4 insertions, 1 deletions

diff --git a/action.c b/action.c
index 602d6c2..1dec134 100644
--- a/action.c
+++ b/action.c
@@ -20,11 +20,13 @@ struct action {
   int x, y;
   enum actions what;
   double when;
+  uint64_t seq;
 };
 
 #define MAXACT 80
 static struct action actions[MAXACT];
 static int action_count;
+static uint64_t next_seq = 0;
 
 void addaction(int x, int y, double when, enum actions what)
 {
@@ -41,6 +43,7 @@ void addaction(int x, int y, double when, enum actions what)
   actions[i].y = y;
   actions[i].when = when;
   actions[i].what = what;
+  actions[i].seq = next_seq++;
   action_count++;
 }
 
@@ -72,7 +75,7 @@ static int sort_by_time(const void *a, const void *b)
 
   /* This *must* be a stable sort! */
   if ( aa->when == bb->when )
-    return (aa < bb) ? -1 : 1;
+    return (aa->seq < bb->seq) ? -1 : 1;
   else
     return (aa->when < bb->when) ? -1 : 1;
 }