Thank you S. S.
As you explained:

   - For case i and ii, I expect the same result as the current output by 
   TW.
   - The third and fourth case are strange for me

@Jed
Thank you Jed, see the below case

\define mac(p)
<$list filter='[<__p__>] +[addprefix[xx-]]'>
item: <<currentTiddler>><br>
</$list>
\end

<<mac [[a b]]>>

---
<$list filter='[[a b]] +[addprefix[xx-]]'>
item: <<currentTiddler>><br>
</$list>

Both gives the same result, e.g. they interpret [[a b]] as a single title. 
This is inline with what S.S quoted from Tiddlywiki.com

>From Title List <https://tiddlywiki.com/#Title%20List>
>
> *A title list is a line of text that presents one or more tiddler titles, 
> strung together with a space between each one and the next.**If a title 
> contains a space, it needs double square brackets around it:*


 It seems filter='$p$ +[otherstep]' causes the strange result. $p$ 
interpreted for [[a b]] as "a" and "b" so there is no difference between 
[[a b]] and "a b".
I expect two things.

--Mohammad

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