rem: mCategories = categories;  mEditor->mCatList->clear(); mEditor->mCatList->insertStringList( mCategories );
add: mCatList->clear(); mCatList->insertStringList(categories); current->setCategoryList(categories);
context: void FilterEditDialog::updateCategorySelection( const QStringList &categories ){  mCategories = categories;  mEditor->mCatList->clear();  mEditor->mCatList->insertStringList( mCategories );}