Fixes not starting minimized on Linux/MacOS systems

Fixes the bug described in #1205 which states that start-minimized didn't work on (some) Linux/MacOS systems

electron/main.js

@@ -165,7 +165,13 @@ function createWindow () {
 	});
 
 	if ( !config.get('start_minimized') && config.get('maximized') ) mainWindow.maximize();
-	if ( config.get('window_display_behavior') !== 'show_trayIcon' && config.get('start_minimized') ) mainWindow.minimize();
+	if ( config.get('window_display_behavior') !== 'show_trayIcon' && config.get('start_minimized') ) {
+		// Wait for the mainWindow.loadURL(..) and the optional mainWindow.webContents.openDevTools() 
+		// to be finished before minimizing
+		mainWindow.webContents.once('did-finish-load', function(e) {
+			mainWindow.minimize();
+		});
+	}
 
 	// Check if the window its outside of the view (ex: multi monitor setup)
 	const { positionOnScreen } = require('./utils/positionOnScreen');