netwm: Make docks and spash screens appear focused

The panel is a dock window, and may appear differently as it is not
focused by default by the window manager.

Set the NET_WM_STATE_FOCUSED property on windows of type dock or
spashscreen so that they don't get the state GTK_STATE_FLAG_BACKDROP set
by default.

src/client.h

@@ -206,6 +206,8 @@
                                          WINDOW_UTILITY)
 #define WINDOW_TYPE_DONT_FOCUS          (WINDOW_SPLASHSCREEN | \
                                          WINDOW_DOCK)
+#define WINDOW_TYPE_STATE_FOCUSED       (WINDOW_SPLASHSCREEN | \
+                                         WINDOW_DOCK )
 
 /* Which bits of opacity are applied */
 #define OPACITY_MOVE                    (1<<0)

src/netwm.c

@@ -130,7 +130,7 @@ clientSetNetState (Client * c)
         TRACE ("clientSetNetState : demands_attention");
         data[i++] = display_info->atoms[NET_WM_STATE_DEMANDS_ATTENTION];
     }
-    if (c == clientGetFocus ())
+    if (c == clientGetFocus () || c->type & WINDOW_TYPE_STATE_FOCUSED)
     {
         TRACE ("clientSetNetState : focused");
         data[i++] = display_info->atoms[NET_WM_STATE_FOCUSED];