add new getters, switch accel target

src/app/browser/window.rs

@@ -165,6 +165,11 @@ impl Window {
     }
 
     // Getters
+
+    pub fn tab(&self) -> &Rc<Tab> {
+        &self.tab
+    }
+
     pub fn gobject(&self) -> &Box {
         self.widget.gobject()
     }

src/app/browser/window/tab.rs

@@ -396,6 +396,11 @@ impl Tab {
     }
 
     // Getters
+
+    pub fn action(&self) -> &Rc<Action> {
+        &self.action
+    }
+
     pub fn gobject(&self) -> &TabView {
         self.widget.gobject()
     }