respect customised id with markdown-it-attrs?

[naivefun]

I'm using markdown-it-attrs and I'd like to assign id to header. But anchor will overwrite the id, is it possible to ignore id slug when an id is already in place?

[nagaozen]

Hum, seems to be right thing to do... Do you have a PR ready?!

[naivefun]

@nagaozen actually I just find out it is there already

markdown-it-anchor/index.js

Lines 64 to 66 in 1cc288c

	let slug = token.attrGet('id')
	if (slug == null) {

I just need put this extension AFTER attrs 😸