```
<$list filter="[all[]]">
<$list
filter="[enlist{!!tags}sort[]join[,]match[playground,rust,test,two words]]"
variable="has_matching_tags">
<$link/><br>
</$list>
</$list>
```
So, this list does what I want and thus answers the question. However, I
think I misunderstand something fundamental about lists and filters.
Filters (typically) take in a set of tiddlers and return a set of tiddlers
as their output, per the documentation
<https://tiddlywiki.com/static/Filters.html>.
In the case of `enlist{!!tags}sort[]join[,]` by itself, the filter output
will be "the current tiddler's tags treated as tiddlers, regardless of
whether they exist or not". And running `match[playground,rust,test,two
words]` as a subsequent step for a single tiddler will either return no
match, or will return "playground,rust,test,two words" (the match docs
<https://tiddlywiki.com/static/match%2520Operator.html> say "potentially
including duplicates", but I couldn't get that to trigger for e.g. `{{{a
[[b c]] [[b c]] +[match[b c]]}}}`).
I just learned that list widgets can be nested; why does the above list
return "the titles of the 10 tiddlers with the appropriate tags rather than
printing the string "playground,rust,test,two words" 10 times, since the
output of `[enlist{!!tags}sort[]join[,]match[playground,rust,test,two
words]]` for a given tiddler will be either no match or
"playground,rust,test,two words"?
On Wednesday, September 22, 2021 at 9:00:20 AM UTC-4 Eric Shulman wrote:
> On Wednesday, September 22, 2021 at 5:23:57 AM UTC-7 [email protected]
> wrote:
>
>> [tag[playground]tag[rust]tag[test]tag[two words]]
>>
>
> The OP goal was to find tiddlers that have all the specified tags, but
> ONLY those tags and no others.
> The problem is that the filter you suggest will also match tiddlers that
> have *other* tags in addition to the four tags specified.
>
> -e
>
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