UIKeyboardFrameEndUserInfoKey reports 0.0 height after waking up in a different orientation

Originator:zaworowski
Number:rdar://34912123 Date Originated:October 10 2017
Status:Open Resolved:
Product:iOS SDK Product Version:11.0 (15A372)
Classification:Bug Reproducible:Always
 
`UIKeyboardWillChangeFrameNotification` reports a wrong keyboard height in `UIKeyboardFrameEndUserInfoKey` after device wakes up in a different orientation prior to waking up.

Steps to Reproduce:

* Launch sample app
* Start in portrait mode
* Rotate the device to landscape
* Turn off the screen
* Rotate device back to portrait
* Turn on and unlock the screen

Expected Results:

Final keyboard frame should have correct height.

Actual Results:

Final keyboard frame has a height of 0.0

Version/Build:

iPhone 8 sim 11.0 (15A372)

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