Merge branch 'master' of gitee.com:spark-community-works-collections/wewechat-plus-plus into dev

Signed-off-by: Riceneeder <845541909@qq.com>

main.js

@@ -482,6 +482,14 @@ function createMenu() {
         mainWindow.setMenu(menu);
     }
 }
+const shouldQuit = app.makeSingleInstance(() => {
+    if (mainWindow) {
+        if (mainWindow.isMinimized()) mainWindow.restore();
+        mainWindow.show();
+        mainWindow.focus();
+    }
+});
+shouldQuit && app.quit();
 
 const createMainWindow = () => {
     var mainWindowState = windowStateKeeper({