When to wrap a filter with quotes

#1

To list my tiddlers tagged with 1 highlight, I used

<$list filter="[tag[1 highlight]]" />

I had to surround the filter with quotes to make it work.

But then when using custom file paths, I noticed that this works fine.

[tag[1 highlight]addprefix[journals/]]

Notice there are no quotes to handle the space in the tag, although it too is a filter.

Question is when do I need quotes to handle a tag or string with spaces inside filters?

#2

Filters themselves have no requirements for quotes. When you use filters as attributes for widgets, you should wrap them in quotes to mark the start and end of the attribute.

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