(Sorry, not quite sure which project to put this in.)

When using the tag filter in Recent Changes, like here, you see all changes with the filter applied. I'd like to be able to hide all the changes with the filter applied as well; this would be quite useful in Wikidata, where a huge number of changes have the tag "Widar [1.3]" applied (28 million changes so far), and can quite often flood up Recent Changes.