csd-background: Log backend/layer-shell outcome at startup.

Author: mtwebster

plugins/background/main.c

@@ -25,15 +25,24 @@
 static void
 pre_gtk_init (void)
 {
-    if (!csd_check_layer_shell_support ()) {
-        g_message ("csd-background: wlr-layer-shell not supported, using X11 backend");
+    if (csd_check_layer_shell_support ()) {
+        g_message ("csd-background: using Wayland backend, gtk-layer-shell supported");
+    } else {
+        g_message ("csd-background: not a Wayland session or wlr-layer-shell protocol not supported, using X11 backend");
         gdk_set_allowed_backends ("x11");
     }
 }
 
 #define PRE_GTK_INIT pre_gtk_init
 #define FORCE_X11_BACKEND FALSE
 #else
+static void
+pre_gtk_init (void)
+{
+    g_message ("csd-background: gtk-layer-shell not built, using X11 backend");
+}
+
+#define PRE_GTK_INIT pre_gtk_init
 #define FORCE_X11_BACKEND TRUE
 #endif