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
}
}

[kurkle]

I'm sorry, but I don't really understand the problem.

Does your data go out of the chart, due to scale not adjusting?
The plugin adjusts scale range to include the annotations by default, you can disable that by settiong adjustScaleRange: false

[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 :)