[gimp] libgimpconfig: cache the "gegl-property-keys" Quark

[Michael Natterer <mitch src gnome org>]

commit 896286279be3c2a86ebfff220a089c8963bad2bf
Author: Michael Natterer <mitch gimp org>
Date:   Fri Jun 12 16:52:26 2020 +0200

    libgimpconfig: cache the "gegl-property-keys" Quark
    
    in gimp_config_param_spec_duplicate().

 libgimpconfig/gimpconfig-params.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/libgimpconfig/gimpconfig-params.c b/libgimpconfig/gimpconfig-params.c
index 62c9103bfd..ee85eb8910 100644
--- a/libgimpconfig/gimpconfig-params.c
+++ b/libgimpconfig/gimpconfig-params.c
@@ -343,8 +343,13 @@ gimp_config_param_spec_duplicate (GParamSpec *pspec)
 
   if (copy)
     {
-      GQuark      quark = g_quark_from_static_string ("gegl-property-keys");
-      GHashTable *keys  = g_param_spec_get_qdata (pspec, quark);
+      GQuark      quark = 0;
+      GHashTable *keys;
+
+      if (G_UNLIKELY (! quark))
+        quark = g_quark_from_static_string ("gegl-property-keys");
+
+      keys = g_param_spec_get_qdata (pspec, quark);
 
       if (keys)
         g_param_spec_set_qdata_full (copy, quark, g_hash_table_ref (keys),