Parcoords: cannot select the first enumerated value with a zero-width range

[alexcjohnson]

The Parallel Coordinates plot does not select the first enumerated value when the individual values are selected as their own constraint ranges.

For example, if the values are [1 ,2, 3] and the constraint range is [[1, 1], [2, 2], [3, 3]], bars will show up next to 2 & 3, but not 1.

This following codepen demonstrates this issue: https://codepen.io/donolingerPHX/pen/oPxQyM

Look at the IndivConstsEnum dimension. Bars show up next to all values except Delta1.

Changing the range for Delta1 (value 1) to [1, 1.01] is enough to get the bar to show up.

The problem seems to exist on the first enumerated value of any dimension, even if the selection is out of order (eg [[2, 2], [1, 1], [3, 3]] it's still 1 that doesn't show up).

reported by @donolingerPHX