Tags exclusion in quick search (with -tag or !tag)
Please describe the problem you are trying to solve
In some cases it is very convenient to filter out some tags using a quick search. E.g. "eva -adam" to see pictures with Eva, but not those where also Adam is visible.
Other solutions you have considered
Currently it is possible to achieve that with a saved search, but it is much less handy for ad-hoc filtering.
Implementation ideas
Words starting with "-" (or "!") should be treated as negation - those tags should be filtered out. Unfortunately currently both "-" and "!" are valid characters in a tag name, however, probably they are not very often used to start a tag name.