the color coding / cuing of OneFolder is absolutely useful, adding to the strong visual orientation it gives for complex tagging. Two reasons would make it equally advisabel to be able to sort tags by colors instead of names as part of thumbnail / previw overlay: 1) "cleanliness" (orientation/readability): this is not meant in terms of a fetish for clean structures, but really from the experience that "spotted" displays especially of metadata (like wild mixes of different colors) easily become distractive and confusing, especially in contexts reliant on "browsing" inforamtion displays, and one loses all the advantages of color coding 2) semantic cuing: actually OneFolder would be the first app to meaningfully support a professional practice I try to follow – creating balanced sets of keywords that cover different aspects equally (aesthetic features; WWW + PEP-scheme; element identification etc.). seeing which kinds of tags I already applied, which not, and how things "balance out" is absolutely helpful for good tagging practice (auditing). For this it helps a lot to see in a glance what kinds of tags I already applied and what their ratio is for an image – this is where color coding is absolutely a blast!
