How to create a view that lists all taxonomy terms of a vocabulary, filtered by a term id?

Question

I have a lot of different vocabularies. On The taxonomy page (the standard view provided) I would like to add a block (view) that takes the current taxonomy id from the url/page and displays all taxonomy terms belonging to the same vocabulary. I tried adding a contextual filter, but when I choose term id from url, the view only shows one term, but I would like to show all terms of the vocabulary the term belongs to.

Of course I could create a block for each vocabulary, but as I have a lot, I'm searching for a more dynamic approach.

For Example: on the page /taxonomy/term/39 I would like to add a block (view) that takes the taxonomy id 39 and lists all terms of the vocabulary the id 39 belongs to.

Answer 1

I created a views argument_default plugin that did the trick:

public function getArgument() {
  if (($taxonomy_term = $this->routeMatch->getParameter('taxonomy_term')) && $taxonomy_term instanceof TermInterface) {
    $vocabulary = $taxonomy_term->bundle();
    return $vocabulary;
  }
}