cb40f0a429
This patch includes the workaround mentioned in Bug 1748808 comment 25 as a short term workaround to prevent the test from failure due to the position where a previous test may have moved the mouse to. The short term test-only workaround would become unnecessary once we have landed a proper longer term fix from Bug 1780008, and so: - if this patch landes before Bug 1780008, as part of Bug 1780008 we should also remove this short term workaround - if Bug 1780008 got already signed and pushed to autoland before this one, then this patch can be just dropped and the related bug marked as fixed by Bug 1780008. Differential Revision: https://phabricator.services.mozilla.com/D152090