[rt-users] Keyword Search behavior for multi-value keywords

[Smylers]

Yesterday Beachey, Kendric wrote:

> Pedantically speaking, I guess "keyword != A" would be satisfied by a
> ticket where the keyword is set to A+B.  (Because A+B != A alone.)

Sounds plausible.  My guess is that "keyword is not A" is being
interpreted as "there exists a keyword with a value that is not B".

I was looking at this kind of thing a few week's ago when wanting to do
"keyword has a value which is either A or B" for a single-select
keyword, but my 'I don't understand this code, but let's plunge right
in, change a few things and see if I get lucky' approach didn't work.

At some point I'll put some effort into going through
DBIx::SearchBuilder properly to work out how this should be done.

Smylers
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