The test assumes the click point is the centre of the element, whereas
WebDriver uses the _in-view_ centre point to perform clicks.
If parts of the element is rendered outside the viewport, the click
point is calculated from visible portion of the element that is seen in
the viewport.
This means that if any portion of an element is within the boundaries of
the viewport, it is clickable. If it is not, then it is not interactable.
This change is unfortunately not accompanied with any
implementation changes, but prepares Marionette for the changes
to the Element Click implementation that will come as part of
https://bugzilla.mozilla.org/show_bug.cgi?id=1321516.
MozReview-Commit-ID: Kh0zzRrtmJ4
--HG--
extra : rebase_source : 63cc463a11d5ca085e7a96ea84dcadbe3bb90204
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3752f5aaf4