compute-scroll-into-view doesn't cope with rtl layouts #821
Description
When the dir attribute of an ancestor node is set to "rtl" compute-scroll-into-view calculates the wrong scrollLeft positions.
To illustrate this I've created a jsfiddle - https://jsfiddle.net/6ckneau1/1/. When you click the "Scroll 7 into view" button in the LTR example it works just fine. When you click the "Scroll 7 into view" in the RTL example it doesn't scroll it into view.
The bug is caused by the way browsers report/use scrollLeft when in RTL. You may want to use a library like this https://github.com/alitaheri/normalize-scroll-left to address this issue.