taxonomy/term query var not set for singular views

[dd32]

The backcompat taxonomy and term query vars are not set on singular views, they're only being set on taxonomy archives.

This has the result that certain plugins which add taxonomies to the URL are affected.

Best to test without Pretty Permalinks enabled:

3.0: http://localhost/wordpress-30-commit/?p=18&colour=red
    array
      'p' => int 18
      'colour' => string 'red' (length=3)
      'taxonomy' => string 'colour' (length=6)
      'term' => string 'red' (length=3)

3.1: http://localhost/wordpress-commit/?p=483&colour=red
before patch:
    array
      'p' => int 483
      'colour' => string 'red' (length=3)
taxonomy/term unset.

after patch:
    array
      'p' => int 483
      'colour' => string 'red' (length=3)
...
      'taxonomy' => string 'colour' (length=6)
      'term' => string 'red' (length=3)

(Those are both looking at $wp_query->query_vars directly in header.php)

Looks good.

i'm not sure if that should be testing $this->tax_query->queries or $this->tax_query, they appear the same to be in testing (tax_query is simply unset) however, the first is used elsewhere.

(In [17147]) Set taxonomy/term back-compat query vars for all views (not just taxonomy indexes). Fixes #15978