Add keyboard support for save as

src/Application.vala

@@ -49,13 +49,17 @@ public class Application : Gtk.Application {
         open_document_action.activate.connect (on_open_document);
         this.add_action (open_document_action);
 
-        //TODO: Vala complains about the method not existing
-        /*SimpleAction saveas_action = new SimpleAction ("saveas", null);
-        set_accels_for_action ("app.saveas", {"<Control>s"});
-        add_action (saveas);
+        SimpleAction saveas_action = new SimpleAction ("saveas", null);
+        set_accels_for_action ("app.saveas", {"<Control><Shift>s"});
+        add_action (saveas_action);
         saveas_action.activate.connect (() => {
-            this.get_active_window ().on_save_as ();
-        });*/
+            unowned var window = this.get_active_window () as AppWindow;
+            if (window == null) {
+                return;
+            }
+
+            window.on_save_as ();
+        });
 
         SimpleAction quit_action = new SimpleAction ("quit", null);
         set_accels_for_action ("app.quit", {"<Control>q"});

src/Window.vala

@@ -33,7 +33,7 @@ public class AppWindow : Gtk.Window {
         };
         var save_as_button = new Gtk.Button.from_icon_name ("document-save-as") {
             tooltip_markup = Granite.markup_accel_tooltip (
-                    {"<Control>s"},
+                    {"<Control><Shift>s"},
                     _("Save as")
             )
         };