Limited functionality for mouse echo in UIA objects

[LeonarddeR]

Steps to reproduce:

1. Open Microsoft Edge.
2. With the python console, try to create a UIA textInfo object at a random point on screen.

Expected behavior:

A UIATextInfo object is returned.

Actual behavior:

NotImplementedError is raised.

Technical background

From the source code:

  	#rangeFromPoint causes a freeze in UIA client library!

This comment was added to the source in 2012.

@michaelDCurran: Could it be that this bug is fixed in UIA, at least on Windows 10?