Shifting items of array option for dataset breaks the chart

[nagix]

Expected Behavior

I created a line chart, and a dataset has a backgroundColor array. When the first items of the data and backgroundColor arrays are removed using shift(), it should be correctly reflected in the chart.

Current Behavior

When the first items of the data and backgroundColor arrays are removed, elements in the chart have wrong colors.

Possible Solution

Not sure, but I suspect that the caching when resolving the options might cause the problem.

Steps to Reproduce

Press 'Push Data' button, then press 'Shift Data' button.

https://jsfiddle.net/nagix/6n34bsym/

Environment

• Chart.js version: 3.2.1

[kurkle]

Its the cached $context that holds the old intex: