Customizing TOC class

[EvidentlyCube]

My goal: make it so that if an item in TOC has a field toc-separator set to 1, an additional space will be added between it and the next item.

Possible solution: custom CSS class added to those entries and the rest will be done with custom CSS.

How to go about this: I initially wanted to do a shado wtiddler overriding existing TOC macros to add this functionality, but I noticed this peculiar parameter in the macros: itemClassFilter. It seems like something I could use.

Problem: No matter what I put into that argument nothing changes in CSS classes. I also notice it's not documented.

Question 1: Why does nothing change regardless of what I put into that argument? I tried a, [a], addprefix[-], [addprefix[-]] and a couple of other options but nothing seems to work so far.

Question 2: Can it actually be used for that or will I have better luck just making a copy of the TOC macro?

[EvidentlyCube]

Anwert to Q1: After looking up filter examples from SetWidget docs I put [tag[HelloThere]] as the filter and noticed that all classes changed to toc-item-selected. Which means that I should've read the documentation of value and emptyValue parameters more carefully - I can never expect the toc to have any other class. Which answers Q2, I need to expand the toc macros.

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I am pretty sure this is the answer, but I'll wait a bit before marking it as THE answer.