- 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.h
#ifndef ATOM_BROWSER_BROWSER_H_
#define ATOM_BROWSER_BROWSER_H_
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/compiler_specific.h"
#include "base/observer_list.h"
#include "base/strings/string16.h"
#include "atom/browser/browser_observer.h"
#include "atom/browser/window_list_observer.h"
#include "native_mate/arguments.h"
#if defined(OS_WIN)
#include "base/files/file_path.h"
#endif
namespace base {
class DictionaryValue;
class FilePath;
}
namespace gfx {
class Image;
}
namespace atom {
class AtomMenuModel;