Extra data being removed for the range bar

[fairking]

If additional data passed to the chart they being removed on drag and the chart not considered as a floatingBar.

data: [ point.from, point.to, point.value ]

1. Consider the data has 2 or more indexes samplePoint.length >= 2:

   floatingBar = (samplePoint !== null) && Array.isArray(samplePoint) && samplePoint.length >= 2

2. Return original dataPoint:

   if (diffFromLeft <= diffFromRight) {
           dataPoint[0] = newVal
           return dataPoint
       } else {
           dataPoint[1] = newVal
           return dataPoint
       }

3. data argument is not used in code:

   function calcPosition(e, chartInstance, datasetIndex, index, data) {

[chrispahm]

@fairking great find! Also thanks for creating a PR, will review ASAP

[fairking]

Please consider to remove white spaces when compare changes: https://github.com/chrispahm/chartjs-plugin-dragdata/pull/82/commits/480c8aded35d840a717a8b159406770d832c7e26?diff=unified&w=1

[artus9033]

Hi @fairking, as the new maintainer, I wanted to pick this one up. Certainly, the changes you suggest would solve the issue, yet AFAIK they are not officially supported (the docs state that the shape of a data point for the floating bar chart should [number, number]). Anyway, since supporting that doesn't come at any cost and chart.js's floating bar controller source also does not seem to prevent this, I will take a look into it.

[artus9033]

Since in the meantime there have been numerous changes and your PR also includes some unrelated things, I will just apply your suggestions in a new PR.