Port changes from -x repo (#3)

* Port config support from -x repo

* Port changes from -x repo

src/gui/mod.rs

@@ -466,6 +466,7 @@ impl<D, S> OverlayRenderer for Canvas<D, S> {
     fn view(&mut self) -> Option<Arc<ImageView>> {
         Some(self.view_final.clone())
     }
+
     fn extent(&self) -> [u32; 3] {
         self.view_final.image().extent().clone()
     }