More post-rebase fixes, add missing flush call

src/macos/window.rs

@@ -264,9 +264,9 @@ impl Window {
         WindowHandle { state: window_state }
     }
 
-    pub fn has_focus(&mut self) -> bool {
+    pub fn has_focus(&self) -> bool {
         unsafe {
-            let view = self.inner.ns_view.as_mut().unwrap();
+            let view = self.ns_view;
             let window: id = msg_send![view, window];
             if window == nil {
                 return false;
@@ -278,9 +278,9 @@ impl Window {
         }
     }
 
-    pub fn focus(&mut self) {
+    pub fn focus(&self) {
         unsafe {
-            let view = self.inner.ns_view.as_mut().unwrap();
+            let view = self.ns_view;
             let window: id = msg_send![view, window];
             if window != nil {
                 msg_send![window, makeFirstResponder:view]

src/x11/window.rs

@@ -118,11 +118,11 @@ impl Window {
         self.close_requested.set(true);
     }
 
-    pub fn has_focus(&mut self) -> bool {
+    pub fn has_focus(&self) -> bool {
         unimplemented!()
     }
 
-    pub fn focus(&mut self) {
+    pub fn focus(&self) {
         unimplemented!()
     }
 

src/x11/x11_window.rs

@@ -120,6 +120,7 @@ impl X11Window {
 
     pub fn show(&self, connection: &XcbConnection) -> Result<(), Box<dyn Error>> {
         connection.conn2.map_window(self.window_id)?;
+        connection.conn2.flush()?;
         Ok(())
     }