[gimp] macos env: Fix #7567, crash on new and open dialog

[Jehan <jehanp src gnome org>]

commit b0547a72c6b6fae3630ed089a9090ff43dc94af2
Author: Lukas Oberhuber <lukaso gmail com>
Date:   Wed Dec 1 23:12:44 2021 +0000

    macos env: Fix #7567, crash on new and open dialog
    
    Fixes https://gitlab.gnome.org/GNOME/gimp/-/issues/7567

 app/main.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/app/main.c b/app/main.c
index d385509f44..e3bfa93531 100644
--- a/app/main.c
+++ b/app/main.c
@@ -390,6 +390,12 @@ gimp_macos_setenv (const char * progname)
       tmp = g_strdup_printf ("%s/share/libwmf/fonts", res_dir);
       g_setenv ("WMF_FONTDIR", tmp, TRUE);
       g_free (tmp);
+      if (g_getenv ("XDG_DATA_DIRS"))
+        tmp = g_strdup_printf ("%s/share:%s", res_dir, g_getenv ("XDG_DATA_DIRS"));
+      else
+        tmp = g_strdup_printf ("%s/share", res_dir);
+      g_setenv ("XDG_DATA_DIRS", tmp, TRUE);
+      g_free (tmp);
       if (g_getenv ("HOME") != NULL)
         {
           tmp = g_strdup_printf ("%s/Library/Application Support/GIMP/3.00/cache",