chore: implemented multiple instances instead of multiple appications? (#4733)

src/main.ts

@@ -23,6 +23,15 @@ import argvFromYargs from './commandLineArgs'
 
 let mainWindow: BrowserWindow | null = null
 
+// Supporting multiple instances instead of multiple applications
+let cmdQPressed = false
+const instances: BrowserWindow[] = []
+const gotTheLock = app.requestSingleInstanceLock()
+if (!gotTheLock) {
+  app.quit()
+  process.exit(0)
+}
+
 // Check the command line arguments for a project path
 const args = parseCLIArgs()
 
@@ -117,16 +126,34 @@ const createWindow = (filePath?: string): BrowserWindow => {
 
   newWindow.show()
 
+  instances.push(newWindow)
   return newWindow
 }
 
+// before-quit with multiple instances
+if (process.platform === 'darwin') {
+  // Quit from the dock context menu should quit the application directly
+  app.on('before-quit', () => {
+    cmdQPressed = true
+  })
+}
+
 // Quit when all windows are closed, even on macOS. There, it's common
 // for applications and their menu bar to stay active until the user quits
 // explicitly with Cmd + Q, but it is a really weird behavior with our app.
+// app.on('window-all-closed', () => {
+//   app.quit()
+// })
 app.on('window-all-closed', () => {
-  app.quit()
+  if (cmdQPressed || process.platform !== 'darwin') {
+    app.quit()
+  }
 })
 
+// Various actions can trigger this event, such as launching the application for the first time,
+// attempting to re-launch the application when it's already running, or clicking on the application's dock or taskbar icon.
+app.on('activate', () => createWindow())
+
 // This method will be called when Electron has finished
 // initialization and is ready to create browser windows.
 // Some APIs can only be used after this event occurs.
@@ -135,6 +162,10 @@ app.on('ready', (event, data) => {
   mainWindow = createWindow()
 })
 
+// This event will be emitted inside the primary instance of your application when a second instance
+// has been executed and calls app.requestSingleInstanceLock().
+app.on('second-instance', (event, argv, workingDirectory) => createWindow())
+
 // For now there is no good reason to separate these out to another file(s)
 // There is just not enough code to warrant it and further abstracts everything
 // which is already quite abstracted