void (@NotNull EditorEx editor, @Nullable DocumentContent content, @NotNull FoldingModelSupport foldingSupport, int editorIndex) { IntUnaryOperator contentLineConvertor = content != null ? getContentLineConvertor(content) : null; IntPredicate foldingLinePredicate = foldingSupport.hideLineNumberPredicate(editorIndex); editor.getGutter().setLineNumberConverter(new DiffLineNumberConverter(foldingLinePredicate, contentLineConvertor)); }