Tag Boolean Not Working

[patruchon]

When creating a <blog list>, the Boolean AND(+)/OR(default)/NOT(-) i.e. (tags apps, +Windows, -iOS) don't seem to work for the "tags" option. See here for more context.

For example,

• This works as it should and lists everything that has tag1 OR tag2:
  tags tag1, tag2
• This doesn't work and lists only pages with tag1 instead of tag1 AND tag2 together:
  tags tag1, +tag2
• This also doesn't work and lists only pages with tag1 instead of tag1 AND NOT tag2:
  tags tag1, -tag2

[Klap-in]

Ah that is right. It is not implemented, maybe that it in the past was partly implemented.
in helper/tags.php there is already a function parse_tag_query() to parse above syntax. But it needs to be applied in the different functions before it will become effective. A pull request is welcome.