- 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.cc
if (!AtomBrowserMainParts::Get()->SetExitCode(code)) {
    
    exit(code);
  } else {
    
    is_quiting_ = true;
    
    is_exiting_ = true;
    
    atom::WindowList* window_list = atom::WindowList::GetInstance();
    if (window_list->size() == 0) {
      Shutdown();
    } else {
      
      
      for (NativeWindow* window : *window_list)
        window->CloseContents(nullptr);  
    }
  }
}
void Browser::Shutdown() {