Fix app single instance lock (#385)

src/main/main.ts

@@ -84,16 +84,6 @@ const installExtensions = async () => {
         .catch(console.log);
 };
 
-const singleInstance = app.requestSingleInstanceLock();
-
-if (!singleInstance) {
-    app.quit();
-} else {
-    app.on('second-instance', () => {
-        mainWindow?.show();
-    });
-}
-
 const RESOURCES_PATH = app.isPackaged
     ? path.join(process.resourcesPath, 'assets')
     : path.join(__dirname, '../../assets');
@@ -666,7 +656,22 @@ const FONT_HEADERS = [
     'font/woff2',
 ];
 
-app.whenReady()
+const singleInstance = app.requestSingleInstanceLock();
+
+if (!singleInstance) {
+    app.quit();
+} else {
+    app.on('second-instance', () => {
+        if (mainWindow) {
+            if (mainWindow.isMinimized()) {
+                mainWindow.restore();
+            }
+
+            mainWindow.focus();
+        }
+    });
+
+    app.whenReady()
         .then(() => {
             protocol.handle('feishin', async (request) => {
                 const filePath = `file://${request.url.slice('feishin://'.length)}`;
@@ -694,3 +699,4 @@ app.whenReady()
             });
         })
         .catch(console.log);
+}