On Wikidata, it would be extremely helpful to be able to invert the filter for "Tag:Widar [1.4]", but I'm not able to find a way to do it. If you go to the normal Recent Changes there, you'll see looooaaads of edits with this tag, so being able remove only them would help significantly with making RC more useful.
Topic on Talk:Edit Review Improvements/New filters for edit review
Thank you for your feedback. This request has already been made and we will consider to enable that option.
We are looking for the best solution about excluding tags from a query. Please comment the options provided, or add your thoughts on the Phabricator task: https://phabricator.wikimedia.org/T174349#5480197
The old french saying "Un chien vivant vaut mieux qu'un lion mort" is applicable here. The proposed solution is quite reasonable.
The "perfect" alternative doesn't seem like it would be used much and may also be quite confusing to explain and to show in the user interface.