Show mainWindow gracefully

http://electron.atom.io/docs/api/browser-window#showing-window-gracefully

CHANGELOG.md

@@ -12,6 +12,9 @@ Release date: TBD
 
 ### Improvements
 
+#### All Platforms
+- Suppress white screen which is displayed for a moment on startup
+
 ### Bug Fixes
 
 #### All Platforms

src/main.js

@@ -447,8 +447,11 @@ app.on('ready', () => {
   if (process.platform === 'linux') {
     windowOptions.icon = path.resolve(assetsDir, 'appicon.png');
   }
-  windowOptions.title = app.getName();
+  Object.assign(windowOptions, {title: app.getName(), show: false});
   mainWindow = new BrowserWindow(windowOptions);
+  mainWindow.once('ready-to-show', () => {
+    mainWindow.show();
+  });
 
   if (process.platform === 'darwin') {
     session.defaultSession.on('will-download', (event, item) => {