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

> We at Mozilla found that this is not web compatible since [jQuery Mobile calls MouseEvent#preventDefault() on desktop browsers without expecting mousemove](https://github.com/jquery/jquery-mobile/issues/8670). We had to [restore our previous behavior](https://bugzilla.mozilla.org/show_bug.cgi?id=1674658#c15) after getting regression reports.

I got confused with this today after seeing that the WPT is [passing](https://wpt.fyi/results/uievents/mouse/mousemove_prevent_default_action.tentative.html?label=master&label=experimental&aligned) in Chrome!  I think this is because the test ends too early before catching the Chrome problem.  Before I land [the change](https://chromium-review.googlesource.com/c/chromium/src/+/4081610), I wanted to double-check: @saschanaz you meant Mozilla now ignores `mosuemove` cancellation again, is this correct?

> We should probably prefer selectionchange event for this purpose and make mousemove not cancelable.

Unfortunately, the `selectionchange` event is [not cancelable](https://w3c.github.io/selection-api/#dfn-selectionchange)!  And I don't see any other candidate event that can possibly allow suppressing selection-extension.

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