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steps to reproduce: 1. open options window 2. select General category check icon selection and header background 3. select UML category there is grey background for any icon after selection exept UML icon (there is white backgrounf), there is black background for any icon in header (except uml icon with white background). As I understand we can use any background with official UML icon even if we can't use gradient fill for symbols.
uml category item was redesigned