Wait to display window until initialization is complete (alacritty#907)

src/display.rs

@@ -197,6 +197,9 @@ impl Display {
             api.clear(background_color);
         });
 
+        // Show the window now that it's been initialized
+        window.show();
+
         Ok(Display {
             window: window,
             renderer: renderer,

src/window.rs

@@ -190,7 +190,8 @@ impl Window {
         Window::platform_window_init();
         let window = WindowBuilder::new()
             .with_title(title)
-            .with_transparency(true);
+            .with_transparency(true)
+            .with_visibility(false);
         let context = ContextBuilder::new()
             .with_vsync(true);
         let window = ::glutin::GlWindow::new(window, context, &event_loop)?;
@@ -266,6 +267,10 @@ impl Window {
         self.window.resize(width, height);
     }
 
+    pub fn show(&self) {
+        self.window.show();
+    }
+
     /// Block waiting for events
     #[inline]
     pub fn wait_events<F>(&mut self, func: F)