Revert "window: Reinstate logic for should_use_csd()"

This reverts commit f043fd532dc66a7abb1d4ea57c666655330cc429.

The whole point of having can_use_csd() return TRUE when GTK_CSD is
unset is to use it inside enable_csd().

https://bugzilla.gnome.org/show_bug.cgi?id=751140

diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 7f4e74b37f42a55eb2db3ad722953cc7e37d7d91..fb8e0b019de1984bb25355c0fddb79dde1a0dbf4 100644 (file)
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -4079,7 +4079,8 @@ gtk_window_can_use_csd (GtkWindow *window)
 
   csd_env = g_getenv ("GTK_CSD");
 
-  return (g_strcmp0 (csd_env, "1") == 0);
+  /* If GTK_CSD is unset we default to CSD support */
+  return csd_env == NULL || (strcmp (csd_env, "1") == 0);
 }
 
 static void