'new-window' event handlers can return their window when default behavior is prevented

lib/browser/guest-window-manager.js

@@ -43,20 +43,8 @@ const mergeBrowserWindowOptions = function (embedder, options) {
   return options
 }
 
-// Create a new guest created by |embedder| with |options|.
-const createGuest = function (embedder, url, frameName, options) {
-  let guest = frameToGuest[frameName]
-  if (frameName && (guest != null)) {
-    guest.loadURL(url)
-    return guest.id
-  }
-
-  // Remember the embedder window's id.
-  if (options.webPreferences == null) {
-    options.webPreferences = {}
-  }
-  options.webPreferences.openerId = embedder.id
-  guest = new BrowserWindow(options)
+// Setup a new guest with |embedder|
+const setupGuest = function (embedder, frameName, guest) {
   if (!options.webContents || url !== 'about:blank') {
     // We should not call `loadURL` if the window was constructed from an
     // existing webContents(window.open in a sandboxed renderer) and if the url
@@ -81,12 +69,10 @@ const createGuest = function (embedder, url, frameName, options) {
     // here, since the window would be cleared of all changes in the next tick.
     guest.loadURL(url)
   }
-
   // When |embedder| is destroyed we should also destroy attached guest, and if
   // guest is closed by user then we should prevent |embedder| from double
   // closing guest.
-  const guestId = guest.webContents.id
-
+  const guestId = guest.id
   const closedByEmbedder = function () {
     guest.removeListener('closed', closedByUser)
     guest.destroy()
@@ -108,7 +94,6 @@ const createGuest = function (embedder, url, frameName, options) {
     embedder.once('render-view-deleted', closedByEmbedder)
     guest.once('closed', closedByUser)
   }
-
   if (frameName) {
     frameToGuest[frameName] = guest
     guest.frameName = frameName
@@ -116,8 +101,26 @@ const createGuest = function (embedder, url, frameName, options) {
       delete frameToGuest[frameName]
     })
   }
+  return guest.id
+}	
 
-  return guestId
+// Create a new guest created by |embedder| with |options|.
+const createGuest = function (embedder, url, frameName, options) {
+  const guest = frameToGuest[frameName]
+  if (frameName && (guest != null)) {
+    guest.loadURL(url)
+    return guest.id
+  }
+
+  // Remember the embedder window's id.
+  if (options.webPreferences == null) {
+    options.webPreferences = {}
+  }
+  options.webPreferences.openerId = embedder.id
+  guest = new BrowserWindow(options)
+  guest.loadURL(url)
+
+  return setupGuest(embedder, frameName, guest)
 }
 
 const getGuestWindow = function (guestId) {
@@ -138,8 +141,13 @@ const getGuestWindow = function (guestId) {
 ipcMain.on('ELECTRON_GUEST_WINDOW_MANAGER_WINDOW_OPEN', function (event, url, frameName, disposition, options, additionalFeatures) {
   options = mergeBrowserWindowOptions(event.sender, options)
   event.sender.emit('new-window', event, url, frameName, disposition, options, additionalFeatures)
+  var newGuest = event.newGuest
   if ((event.sender.isGuest() && !event.sender.allowPopups) || event.defaultPrevented) {
-    event.returnValue = null
+	if (newGuest != undefined && newGuest != null) {
+      event.returnValue = setupGuest(event.sender, frameName, newGuest)
+	} else {
+      event.returnValue = null
+	}
   } else {
     event.returnValue = createGuest(event.sender, url, frameName, options)
   }