[MlMt] SubjectCopying messages

[John Cooper]

Benny Kjær Nielsen wrote (at 6:17 on 8 Jun 2015):

> On 8 Jun 2015, at 14:28, David Green wrote:
>
>> On 8 Jun 2015, at 2:16, Thomas Eckhold wrote:
>>
>> Shouldn't the "Move to Mailbox" heading change to "Copy to Mailbox" 
>> when the option key is pressed?
>
> That would be nice, but it's non-trivial to implement (monitoring 
> modifier keys). Well, that just means it's not a standard GUI feature 
> and I haven't tried looking into implementing it myself :-)

I notice it happens in the MailMate menu. Doesn't that mean it's 
provided by Cocoa, or some such framework?