[MlMt] Select Duplicates

[Benny Kjær Nielsen]

On 2 Jan 2014, at 17:59, Shawn Morris wrote:

> Is this functionality broken? When I select it in a mailbox with known
> duplicates, it seems to select nothing.  How is it determining 
> duplicates?
> I assume Message-ID, but if it's trying to build some kind of tuple of
> (from,to,subject,date) i could see why that wouldn't work.  I have a 
> lot of
> messages where I'm receiving copies through multiple mailing lists and 
> I'm
> not able to de-duplicate on the server-side.

It's not broken, but it's a bit primitive/inflexible. It is based on 
`Message-ID` *and* message size. I would actually like it to be more 
strict by basing it on a message digest value to make sure the messages 
are identical, but you need it to be less strict.

Using the `selectWithFilter:` custom key binding it would be possible to 
make something based on `Message-ID` only. It would work differently 
though:

* it would be based on the currently selected message
* it would select all messages instead of all-but-one (which is how the 
menu item works to make it easy to delete duplicates without deleting 
the “original”).

It's difficult to make the menu item work in a way that is suitable for 
all use cases. It might make more sense to implement the necessary 
“building blocks” to do this using a bundle command (2.0 feature). 
(These are building blocks needed anyways.) That would allow customizing 
it to behave any way you like *and* make it happen automatically using a 
rule on incoming messages.

-- 
Benny
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