Create synthetic event for new windows created from external application

Related discussion:
- uBlockOrigin/uAssets#10323 (comment)

Synthesize a onCreatedNavigationTarget event for new browser windows
created as a result of an external application triggering a navigation
event.

platform/chromium/vapi-background-ext.js

@@ -28,6 +28,8 @@
 // https://github.com/uBlockOrigin/uBlock-issues/issues/1659
 // Chromium fails to dispatch onCreatedNavigationTarget() events sometimes,
 // so we synthetize these missing events when this happens.
+// https://github.com/uBlockOrigin/uAssets/issues/10323
+// Also mind whether the new tab is launched from an external application.
 
 vAPI.Tabs = class extends vAPI.Tabs {
  constructor() {
@@ -65,12 +67,11 @@ vAPI.Tabs = class extends vAPI.Tabs {
  synthesizeNavigationTargetEvent(details) {
  if ( this.tabIds.has(details.tabId) === false ) { return; }
  this.tabIds.delete(details.tabId);
- if (
- Array.isArray(details.transitionQualifiers) === false ||
- details.transitionQualifiers.includes('client_redirect') === false
- ) {
- return;
- }
+ const isClientRedirect =
+ Array.isArray(details.transitionQualifiers) &&
+ details.transitionQualifiers.includes('client_redirect');
+ const isStartPage = details.transitionType === 'start_page';
+ if ( isClientRedirect === false && isStartPage === false ) { return; }
  this.onCreatedNavigationTargetHandler({
  tabId: details.tabId,
  sourceTabId: details.tabId,