Workaround for what seems to be a race in Xserver

There seems to be a race between DamageAdd (what the client uses
to report damage to Xserver) and DamageSubtract (what compton uses
to clear the reported damage, so it can receive new ones). I am not
sure how to confirm this. But this (terrible) workaround seems to
solve this problem.

src/win.c

@@ -878,7 +878,7 @@ bool add_win(session_t *ps, Window id, Window prev) {
 
     // Create Damage for window
     set_ignore_next(ps);
-    new->damage = XDamageCreate(ps->dpy, id, XDamageReportNonEmpty);
+    new->damage = XDamageCreate(ps->dpy, id, XDamageReportRawRectangles);
   }
 
   calc_win_size(ps, new);