If we use border in the grid container and positioned items in vertical writing mode, the items are not placed in the right position.
The issue is that in RenderGrid::offsetAndBreadthForPositionedChild() we are using borderLeft().
This is a port of: https://codereview.chromium.org/1909153002/
Created attachment 276959 [details]
Comment on attachment 276959 [details]
Clearing flags on attachment: 276959
Committed r199874: <http://trac.webkit.org/changeset/199874>
All reviewed patches have been landed. Closing bug.