Re: [w3c/uievents] mousemove and preventDefault() (#278)

According to the spec, a "mousemove" event has no default action. But a "mousedown" event has.
For the former to be consistent with the latter, the former should get a default action consisting of  _extending_ a possibly started selection.

That would match Chrome's and Firefox's behavior when `preventDefault()` is **not** called. Firefox would then have to follow Chrome's behavior of not extending the selection when `preventDefault()` was called.

AFAIK, Safari's behavior is the same as Chrome's.

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