- Electron version: 0.37.6
- Operating system: Windows 10

In VSCode, in order to support screen readers while editing text, we set the contents of a `<textarea>` to the contents of the line and lines surrounding the cursor and we mirror the editor selection in the `<textarea>` via `setSelectionRange`.

Chromium is not the fastest when it comes to setting large amounts of text :) (such as > 10,000 characters) and basically stalls all the time. Apparently, Electron already has some knowledge about when a screen reader is attached to the main process window (in C++ code). Is it possible to expose this as a getter + event when it first happens in the `electron` API.

We could then maintain this costly `<textarea>` sync only when really needed.

atom/browser/browser_observer.h
virtual void OnQuit() {}
  
  
  virtual void OnOpenFile(bool* prevent_default,
                          const std::string& file_path) {}
  
  virtual void OnOpenURL(const std::string& url) {}
  
  
  virtual void OnActivate(bool has_visible_windows) {}
  
  virtual void OnWillFinishLaunching() {}
  virtual void OnFinishLaunching() {}
  
  virtual void OnLogin(LoginHandler* login_handler,
                       const base::DictionaryValue& request_details) {}
#if defined(OS_MACOSX)
  
  virtual void OnContinueUserActivity(
      bool* prevent_default,
      const std::string& type,
      const base::DictionaryValue& user_info) {}
#endif
 protected:
  virtual ~BrowserObserver() {}
};
}  
#endif