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fix 2 bugs:

  1. alertWindow still show after alertView dismissed. To duplicate this
    bug, just set alertView.backgroundColor = [UIColor redColor]; before
    show it.
  2. tap Screen after alertView dismissed, iOS log error message:
    unexpected nil window in _UIApplicationHandleEventFromQueueEvent,
    _windowServerHitTestWindow: (null)
    Solution:
  3. remove invokes of removeFromSuperview for UIWindow instance.
  4. make __si_alert_background_window and alertWindow hidden when
    dismiss alertView.

azureatom added 4 commits November 4, 2015 15:51
1. alertWindow still show after alertView dismissed. To duplicate this
bug, just set alertView.backgroundColor = [UIColor redColor]; before
show it.
2. tap Screen after alertView dismissed, iOS log error message:
unexpected nil window in _UIApplicationHandleEventFromQueueEvent,
_windowServerHitTestWindow: (null)
Solution:
1. remove invokes of removeFromSuperview for UIWindow instance.
2. make __si_alert_background_window and alertWindow hidden when
dismiss alertView.
fixing bug: modify containerView position after keyboard popup.
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