New Feature Request: 3 states for tag selection
                    In the interactive UI, I'd like select tags to rotate between 3 states. 
* Unselected - text just shows against background of text box.
* Green Rectangle - the tag must be on the item
* Red Rectangle - the tag must not be on the item.
Multiple tag selection would work as "anded" as it does now.
                            * Unselected - text just shows against background of text box.
* Green Rectangle - the tag must be on the item
* Red Rectangle - the tag must not be on the item.
Multiple tag selection would work as "anded" as it does now.
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I would very much appreciate two ways of using tags:
1) a negative selection: "show items that DO NOT have this tag"
2) a perfect fit selection: show items that have ONLY this tag or these tags"
I noticed that at least nr. 1 can be done by using the search: https://forums.zotero.org/discussion/73769/feature-request-ability-to-view-citations-which-do-not-have-a-specific-tag/p1