How can I build a tree that only shows each node once?
Using the code below, if a tiddler is tagged with any of it's parent's
tags, it will apeear multiple times in the tree. I'd like it to appear at
the uppermost level only, once.
```
\define tree(tiddler)
;[[$tiddler$]]
:<$transclude tiddler="My Project" mode=block/>
\end
<$list filter="[<currentTiddler>tagging[]]">
<$macrocall $name=tree tiddler={{!!title}}/>
</$list>
```
I'm thinking I need another macro that will build up the list filter,
adding !title for each tiddler encountered. Is it possible?
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