Hide Hyperspace window on startup and show once page contents are loaded

Signed-off-by: Marquis Kurt <software@marquiskurt.net>

public/electron.js

@@ -1,6 +1,6 @@
 // desktop.js
 // Electron script to run Hyperspace as an app
-// © 2018 Hyperspace developers. Licensed under Apache 2.0.
+// © 2018 Hyperspace developers. Licensed under NPL v1.
 
 const { app, Menu, protocol, BrowserWindow, shell, systemPreferences } = require('electron');
 const windowStateKeeper = require('electron-window-state');
@@ -137,7 +137,10 @@ function createWindow() {
             titleBarStyle: 'hiddenInset',
             vibrancy: "sidebar",
             transparent: darwin(),
-            backgroundColor: darwin()? "#80000000": "#FFF"
+            backgroundColor: darwin()? "#80000000": "#FFF",
+
+            // Hide the window until the contents load
+            show: false
         }
     );
 
@@ -162,6 +165,11 @@ function createWindow() {
         });
     }
 
+    // Only show the window when ready
+    mainWindow.once('ready-to-show', () => {
+        mainWindow.show();
+    });
+
     // Delete the window when closed
     mainWindow.on('closed', () => {
         mainWindow = null