Grid Cell/Row focus server side events

We would like to be able to get an event generated at the server side when a cell focus change occurs(similar to the one for selection).

Our use case is a master-detail view for a messaging application and we need all of the following to work together:

1. Multi-Selection of rows
2. Drag and Drop support for currently selected rows
3. Keyboard navigation - focus events to update the detail
4. Item click events - to update the detail

While everything works as expected we also need a way to get the keyboard focus events to work properly which is currently not possible.

So as it stands we switched back to using the v7 Table.

I see there are lot of issue/requests(#7081, #8349 and #9506 ) regarding a Grid focus API but no responses/comments, which makes me wonder if there are any plans at all to add Focus API support for Grid at all in the future?

Vaadin Version: 8.1.0.beta1

Start by reviewing the existing Grid selection event API and the related focus requests #7081, #8349, and #9506. Confirm how keyboard focus changes are represented and how they should interact with multi-selection, drag and drop, and item clicks. Done means a server-side focus-change event supports the stated master-detail use case.