Add "TagLabel--child" class to aid with custom theming

[davwheat]

I've run into issues with theming tags in discussion lists and other areas as there's nothing in the DOM that can be used to differentiate between primary/secondary/child tags.

Adding this custom data attribute would be super helpful for theming, especially with extensions like night mode where keeping the tags the same colour between light/dark could make them unreadable.

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PS: The repo seems to be missing the Prettier stuff that other core repos have. Should I PR it all in?

[dsevillamartin]

Instead of having it equal true or false, I'd rather have it present or not present. Thoughts?

Also - make sure you use single quotes for strings.

[davwheat]

Instead of having it equal true or false, I'd rather have it present or not present. Thoughts?

Sounds good. I'll do data-is-child=true and not present, as that seems to match where this sort of stuff is done elsewhere in core.

Also - make sure you use single quotes for strings.

Oops. I'm gonna make a PR to add .prettierrc and the format script because I keep forgetting.

[SychO9]

why not use a class instead ? TagLabel--child

[dsevillamartin]

Actually, what @SychO9 makes more sense, my bad. We use classes for mostly everything, stuff like if the Post was made by the current user, etc... so TagLabel--child does make more sense.

[davwheat]

Ah, that's true. I've always been a fan of data attributes over classes for identifying features like this (generally because they're tstable with ^= or *=, but since classes are used for everything, that's probably a better idea.