Hence, found only one solution by my own means:
*I.* Have different stylesheet files logically separated.
tables.css:
> .old-fashion-table { }
>
lists.css:
> .lovely-list { }
*II.* For each stylesheet define one CssResource descendant interface with
predefined @ImportedWithPrefix annotation
Let's say I've inherited "clean" theme
and further I made a decision to improve a bandwidth aspect of my project,
so I need to obtain a workaround to use solely chosen styles derived
manually from the com/google/gwt/user/theme/clean/clean.css. In a
simplified approach the easiest sufficient
