getCoordsRelativeToElement: use getBoundingClientRect and clientX/Y.#1788

Merged

Tyriar merged 5 commits intoxtermjs:masterfrom

gou4shi1:fix-get-mouse-coord

Dec 10, 2018

Commits on Nov 15, 2018

Commits on Dec 6, 2018

Fix build fail
gou4shi1
committed

Commits on Dec 9, 2018