Stacked line chart does not auto-adjust y-axis minimum value

[ti-lei]

Hi thanks for this amazing tool, I tried to induce it into my line chart though i found out i cant have my y-axis auto-adjusted. it will set the y axis to start from zero as i import the plugging
i don't know if it's because the following setting( stacked: true) somehow disables the auto-adjusting function. how could i have my y-axis back to auto-adjusted mode?
// Core options
scales: {
y: {
stacked: true
}
}

[ti-lei]

HI thanks for your reply
it's like this, those fig's y-axis all starts from zero, but I want it to be auto-adjusted by the values in the charts.

[kurkle]

So, this does not need to have the annotations in the chart, moving this issue over to core repo.

[kurkle]

Repro: https://codepen.io/kurkle/pen/XWMWQer

[etimberg]

Probably due to || stacked in https://github.com/chartjs/Chart.js/blob/master/src/scales/scale.linearbase.js#L165 but unsure if removing that breaks anything

[kurkle]

The expectation for stacked min value was changed here: #1963

It looks like the expectation is to start a stacked bar chart from zero. This is handled today by having beginAtZero default to true for bar charts, so I think we can quite safely enable this use case too. I'll create a PR and leave the decision to @etimberg :)