[MlMt] `t` shortcut no longer applies or removes tags correctly; Message > Tag works

[Jim Mccarty]

Hi all,

Has anyone else had trouble with the `t` (tag) shortcut lately? Multiple 
tags used to work fine for me. Now `t` seems unreliable, while the 
Message > Tag menu works.

What I’m seeing:

Using `t`, I add one tag and it sticks. When I add a second tag, both 
tags disappear.
Using Message > Tag, multiple tags stay on the message as expected.
Once tags are on a message (added via the menu), `t` can’t add another 
one. A third tag simply doesn’t apply.
`t` can’t remove tags either. If I press `t`, delete the existing tags 
from the field and hit Return, nothing changes and the tags remain.

I see the same behavior with Fastmail and Gmail, both IMAP.

How I checked: I look at the Tags line in the message header area (above 
the body). With one tag applied via `t`, it shows there. After adding a 
second tag with `t`, the Tags line goes blank. A smart mailbox filtered 
on the tag agrees: the message shows up with one tag, and disappears 
after I add the second.

Repro:

Select an untagged message.
Press `t` and apply tag A. The Tags line shows A.
Press `t` and apply tag B. The Tags line goes empty.
Apply tags through Message > Tag instead. They persist.
With those tags in place, press `t` to add or remove a tag. Nothing 
changes.

System: MailMate 6272, macOS 27.0.1 (26A434), Apple Silicon (Mac15,11).

I sent a report to mm-feedback on Oct 5 but haven’t heard back, and 
I’ve only now narrowed it to the `t` shortcut. Can anyone reproduce 
it, or confirm `t` works for them? A workaround would also be welcome 
(for now I’m using the menu).

Thanks,
Jim
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