Issue #15 [GUI] Use filter to avoid sending ignored messages over dbus

src/blackmisc/logpattern.h

@@ -96,6 +96,9 @@ namespace BlackMisc
         //! This class acts as a SharedState filter when stored in a CVariant.
         bool matches(const CVariant &message) const { return match(message.to<CStatusMessage>()); }
 
+        //! Technical category names matched by this pattern.
+        QSet<QString> getCategoryStrings() const { return m_strings; }
+
         //! Returns true if this pattern is a proper subset of the other pattern.
         //! \see     https://en.wikipedia.org/wiki/Proper_subset
         //! \details Pattern A is a proper subset of pattern B iff pattern B would match every category which pattern A matches,