st/shadow: Add a fast path to comparisons

We do this in most places in St, it's consistent to do it here, too.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1744>

diff --git a/src/st/st-shadow.c b/src/st/st-shadow.c
index ab3eaa856b0cd39aeb1883b9b402145f99544d87..0a8e319ad45b11cebb34dbd3e2950445fbf1fe8f 100644 (file)
--- a/src/st/st-shadow.c
+++ b/src/st/st-shadow.c
@@ -126,6 +126,9 @@ st_shadow_equal (StShadow *shadow,
   g_return_val_if_fail (shadow != NULL, FALSE);
   g_return_val_if_fail (other != NULL, FALSE);
 
+  if (shadow == other)
+    return TRUE;
+
   /* We use strict equality to compare double quantities; this means
    * that, for example, a shadow offset of 0.25in does not necessarily
    * compare equal to a shadow offset of 18pt in this test. Assume