Hi, I tried to emerge mysql-gui-tools, and gtkhtml was a dep (that on my system pulls half gnome in). So I poked in the sources, and I saw that apparently only query-browser depends on gtkhtml. So I think gtkhtml could be made conditional on query-browser use. Workbench seems to work fine here (x86) without gtkhtml.
Created attachment 121479 [details, diff] adds query-browser as a condition to gtkhtml dependency.
Thanks, I updated the ebuilds.