- Electron version: v0.36.9
- Operating system: Windows 10/OS X

In #779 a `disposition` was added to the `new-window` event in [webContents](https://github.com/atom/electron/blob/master/docs/api/web-contents.md#event-new-window) but it always seems to be set to `new-window` when clicking on target="_blank" links in our web app wrapper: https://github.com/irccloud/irccloud-desktop/blob/v0.1.3/app/main.js#L109

If I Ctrl (Win) or Cmd (OS X) or middle click on links, I would expect to see a `background-tab` disposition, as in Chrome that will open links in a background tab, while keeping focus on the current tab. I'd like to catch this behaviour to set `activate` to false in `shell.openExternal`.

Is this possible?

atom/browser/api/atom_api_app.h
scoped_ptr<content::ClientCertificateDelegate> delegate) override;
  
  void OnGpuProcessCrashed(base::TerminationStatus exit_code) override;
#if defined(OS_MACOSX)
  void OnPlatformThemeChanged() override;
#endif
  
  mate::ObjectTemplateBuilder GetObjectTemplateBuilder(
      v8::Isolate* isolate) override;
 private:
  
  base::FilePath GetPath(mate::Arguments* args, const std::string& name);
  void SetPath(mate::Arguments* args,
               const std::string& name,
               const base::FilePath& path);
  void SetDesktopName(const std::string& desktop_name);
  void AllowNTLMCredentialsForAllDomains(bool should_allow);
  bool MakeSingleInstance(
      const ProcessSingleton::NotificationCallback& callback);
  std::string GetLocale();
#if defined(OS_WIN)
  bool IsAeroGlassEnabled();
#endif
  scoped_ptr<ProcessSingleton> process_singleton_;
  DISALLOW_COPY_AND_ASSIGN(App);
};
}  
}  
#endif