Function orderFn2

src/components/legend/get_legend_data.js:121–128

(a, b)

    };

    var orderFn2 = function(a, b) {
        var a_rank = isArrayOrTypedArray(a.trace.legendrank) ? a.trace.legendrank[a.i] : a.trace.legendrank;
        var b_rank = isArrayOrTypedArray(b.trace.legendrank) ? b.trace.legendrank[b.i] : b.trace.legendrank;
        return (
            (a_rank - b_rank) ||
            (a._preSort - b._preSort) // fallback for old Chrome < 70 https://bugs.chromium.org/p/v8/issues/detail?id=90
        );
    };

    // sort considering minimum group legendrank
    legendData.forEach(function(a, k) { a[0]._preGroupSort = k; });