[MlMt] DeleteMessage: from single-message window doesn't seem to work right

[Benny Kjær Nielsen]

On 17 May 2017, at 2:26, Mike Petonic wrote:

> [deletion in single message window]
>
> ... MM always behaves as if "none" were the value of the key 
> "MmMessagesOutlineMoveStrategy".

The outline strategy is not applied because the message is deleted in a 
window which only has a single message. The “link” between the 
mailbox window and the single message window is quite weak which also 
affects other things including undo behavior.

I've tried to improve this a bit in the latest test release 
(1.9.6r5378). You are welcome to try that out.

-- 
Benny