feat: implement EchidnaWindow::to_imp()

src/components/window/mod.rs

@@ -8,6 +8,7 @@ mod imp;
 pub mod menubar;
 
 use glib::object::IsA;
+use gtk::subclass::prelude::*;
 
 glib::wrapper! {
     pub struct EchidnaWindow(ObjectSubclass<imp::EchidnaWindow>)
@@ -24,4 +25,8 @@ impl EchidnaWindow {
             Err(e) => panic!("Error in making EchidnaApplication {}", e),
         }
     }
+
+    pub fn to_imp(&self) -> &imp::EchidnaWindow {
+        imp::EchidnaWindow::from_instance(self)
+    }
 }