Just to notify you of a big recent (committed today to trunk) change in Lancelot’s theming.
The items in the lists (ActionListView widget) now shouldn’t have a background - the standard background from Plasma (widgets/viewitem.svgz - the one you see in krunner, folder view, SAL…) is being used.
The only item that is excluded from this rule is the [Group-ActionListView-Categories] which is used for sublist headers (like ‘Recent documents’ inside the Documents section).
If you don’t remove the backgrounds, both backgrounds will be shown on mouse hover.
In order to adapt your theme to the new change, edit all sections in theme.config file that match [Group-ActionListView-*] and replace:
This change will become active in KDE 4.5 so you have a lot of time to adapt. Cheerio!