Problem with mousedown/drag both firing (Bug #1341413)

It looks like if we have the drag code first it stops the click from
firing the addblock dialog box from also happening.

Change-Id: If261fcfb2185b647d2fab61d8f2c4f7369ff8e9d
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Merge "Problem with mousedown/drag both firing (Bug #1341413)"