Ignore dock and desktop windows

Fixed logic that determines whether the window in focus is the desktop
by using the window type from WNCK. Also added the Dock type to avoid
showing mate-menu and mate-panel, since activating them has undefined
behavior.

window-buttons-applet/window-buttons-applet.vala

@@ -218,13 +218,17 @@ namespace WindowButtonsApplet{
 
 		private Wnck.Window get_current_window(){
 			Wnck.Window* win = null;
+			Wnck.WindowType window_type;
 			string behaviour = gsettings.get_string("behaviour");
 
 			switch(behaviour){
 				case "active-always":
 					win = Wnck.Screen.get_default().get_active_window();
-					if(win != null && win->get_class_instance_name() == "desktop_window")
-						win = null;
+					if(win != null){
+						window_type = win->get_window_type();
+						if(window_type == Wnck.WindowType.DESKTOP || window_type == Wnck.WindowType.DOCK)
+							win = null;
+					}
 				break;
 				case "active-maximized":
 					win = Wnck.Screen.get_default().get_active_window();

window-menu-applet/window-menu-applet.vala

@@ -76,13 +76,17 @@ namespace WindowMenuApplet{
 
 	private Wnck.Window get_current_window(){
 		Wnck.Window* win = null;
+		Wnck.WindowType window_type;
 		string behaviour = gsettings.get_string("behaviour");
 
 		switch(behaviour){
 			case "active-always":
 				win = Wnck.Screen.get_default().get_active_window();
-				if(win != null && win->get_class_instance_name() == "desktop_window")
-					win = null;
+				if(win != null){
+					window_type = win->get_window_type();
+					if(window_type == Wnck.WindowType.DESKTOP || window_type == Wnck.WindowType.DOCK)
+						win = null;
+				}
 			break;
 			case "active-maximized":
 				win = Wnck.Screen.get_default().get_active_window();

window-title-applet/window-title-applet.vala

@@ -59,13 +59,17 @@ namespace WindowTitleApplet{
 
 	private Wnck.Window get_current_window(){
 		Wnck.Window* win = null;
+		Wnck.WindowType window_type;
 		string behaviour = gsettings.get_string("behaviour");
 
 		switch(behaviour){
 			case "active-always":
 				win = Wnck.Screen.get_default().get_active_window();
-				if(win != null && win->get_class_instance_name() == "desktop_window")
-					win = null;
+				if(win != null){
+					window_type = win->get_window_type();
+					if(window_type == Wnck.WindowType.DESKTOP || window_type == Wnck.WindowType.DOCK)
+						win = null;
+				}
 			break;
 			case "active-maximized":
 				win = Wnck.Screen.get_default().get_active_window();