[MlMt] Move not copy recipients

[John D. Muccigrosso]

On 10 Feb 2017, at 10:12, Benny Kjær Nielsen wrote:

> There's no setting for this. “Move” is supposed to be the default. 
> Holding down ⌥ or ⌘ should change it to “Copy”. It's a bit of 
> a hack though (most things are with relation to the NSTokenField class 
> used for email addresses) and I certainly don't rule out that some 
> corner cases won't work as expected. Don't put anything into the 
> display of the plus sign (some times) shown. It doesn't necessarily 
> reflect what happens.

It looks like dragging _multiple_ recipients does result in a copy and 
not a move in MM 2.0.

John