ENABLE_VP behaviour is not as expected

[heswell]

ENABLE_VP and DISABLE_VP are called by us to suspend messaging between server and client on a given VP. UI uses this when user closes a tab that they might later return to and that tab hosts a table with vuu subscription. Stops us having to process updates for a table that user isn't currently viewing.

ENABLE_VP is invoked when user reopens the closed tab. It is expected that server will send an up-to-date set of TABLE_ROW data for the viewport following ENABLE_VP_SUCCESS. This doesn't seem to be happening.

[stonesmi]

Definitely a server side issue, as I've reproduced it in tests.

Will investigate further and fix.

[stonesmi]

As discussed, from the server POV, it is sending the delta of what has changed since the VP was disabled and not a full refresh.

@heswell is ok with this, and will make changes to the client.