Explicit focus webview on macOS alone.

app/main/index.js

@@ -57,6 +57,7 @@ function createMainWindow() {
 		icon: iconPath(),
 		minWidth: 600,
 		minHeight: 500,
+		titleBarStyle: 'hidden',
 		webPreferences: {
 			plugins: true,
 			allowDisplayingInsecureContent: true,

app/renderer/js/components/webview.js

@@ -104,7 +104,7 @@ class WebView extends BaseComponent {
 		// The bug is introduced from Electron and this is a tempory fix.
 		// See https://github.com/zulip/zulip-electron/issues/216
 		const osName = SystemUtil.getOS();
-		if (osName === 'Mac' || osName === 'Linux') {
+		if (osName === 'Mac') {
 			this.$el.focus();
 		}
 	}