Doughnut tooltips displayColors problem

After the upgrade to 2.7 I found a bug. When the option displayColors: false is set the text color of tooltips are black. I tryed to set the bodyFontColor: ‘#ffffff’, etc but the color text on the tooltips are always black.

this is my code:

var myChart	 = new Chart(ctx, {
    type: 'doughnut',
    data: data<?php echo $grafico_key; ?>,
    options: {
        responsive: true,
        maintainAspectRatio: false,
        animation: {
            duration: 2000,
        },
        legend: {
            display: false
        },
        tooltips: {
            mode: 'label',
            position: 'nearest',
            xPadding: 10,
            yPadding: 10,
            bodyFontSize: 15,
            bodySpacing: 8,
            caretSize: 10, //freccetta
            displayColors: false,
            bodyFontColor: '#fff',
            callbacks: {
                label: function(tooltipItem, data) {
                    var valore = aggiungiPercento(data.datasets[0].data[tooltipItem.index].toString().trim());
                    return (data.labels[tooltipItem.index] + ": " + valore);
                },
                labelTextColor: function(tooltipItem, chart) {
                    return '#ffffff';
                }
            }
        }
    }
}); 

Edit (SB): code formatting

[etimberg]

@EmilMoe #4766 has a fix for this

[simonbrunel]

You need to use https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.0/Chart.bundle.js for the fiddle to work.