Media Foundation is a framework for encoding/decoding multimedia
content on Windows Vista and above. A Media Foundation Transform (MFT)
is a module implementing an encoder, a decoder or a filter.

MFTs can be enumerated and initialized using the function MFTEnumEx.
A MFT can be SW or HW, synchronous or asynchronous.

Previous code was never called for fullscreen and video-on-top.

close #9999

Also fixes bug for retina displays where events got missed because
stored value is the pixel value, but new one is the point value.
(close #10743)

refs #10222

ret cannot be NULL.

Also fix format string.

refs #1532

confusion: wanted min of max.

A better way would probably keep not asking and
seek and load index when 'slow' seekable.

To avoid collisions with existing touch gesture recognizers, a double-tap is needed to trigger a left-click mouse event

This fails in one of three attempts in Webkit and even more often in Gecko browsers