Chris H-C fdd7e32ba8 Bug 506815 - Replace MouseTrailer with TrackMouseEvent. r=jimm ...

MouseTrailer, using a 200ms timer, was used to track whether a pointer was
still present over a window.

Windows has, since Windows 2000, offered to do this for us via an API called
TrackMouseEvent. (It'll also give us hover timings and non-client area versions
if we want)

I'm all for having Windows do the work for us, and it'll save us from waking up
the main thread five times a second.

2015-11-20 07:42:00 +01:00

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