Post Selector: Add option to adjust taxonomies relationship
This issue is an expansion of https://github.com/siteorigin/so-widgets-bundle/pull/752. The summary is to allow for a more advanced syntax in the Taxonomies field.
Add support the AND and OR relations directly in the field. I.e. the Taxonomies field would allow simple entries like
OR(category:quotes,post_format:post-format-quote)
which would be equivalent to what we have currently as
category:quotes,post_format:post-format-quote
and we could allow more complex nested queries like
OR(category:quotes,AND(post_format:post-format-quote,category:wisdom))
The general idea is to not add another field and just allow a slightly more complex syntax for advanced users.
Related forum thread: https://siteorigin.com/thread/syntax-for-requiring-multiple-categories-in-post-loop-taxonomy/. This comes up a couple of times a month.