[gtk/wip/chergert/glproto] short-circuit when offsets match

[Christian Hergert <chergert src gnome org>]

commit becca3660e1f4624226701119abffb77724ae2b1
Author: Christian Hergert <chergert redhat com>
Date:   Thu Feb 18 21:08:42 2021 -0800

    short-circuit when offsets match

 gsk/next/gskglcommandqueue.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/gsk/next/gskglcommandqueue.c b/gsk/next/gskglcommandqueue.c
index b4c953adba..f5677a76ac 100644
--- a/gsk/next/gskglcommandqueue.c
+++ b/gsk/next/gskglcommandqueue.c
@@ -305,6 +305,10 @@ snapshots_equal (GskGLCommandQueue *self,
       gconstpointer sdata;
       gsize len;
 
+      /* Short circuit if we'd end up with the same memory */
+      if (fu->info.offset == su->info.offset)
+        continue;
+
       if (fu->info.format != su->info.format ||
           fu->info.array_count != su->info.array_count)
         return FALSE;