Constraint-type contour plot cannot shade entire area

Steps to reproduce

Create plotly.js data object with the following:

var data = [ {
  z: [[10, 10.625, 12.5, 15.625, 20],
       [5.625, 6.25, 8.125, 11.25, 15.625],
       [2.5, 3.125, 5., 8.125, 12.5],
       [0.625, 1.25, 3.125, 6.25, 10.625],
       [0, 0.625, 2.5, 5.625, 10]],
  type: 'contour',
  colorscale: 'Jet',
    "contours": {
        "coloring": "lines",
        "operation": "][",
        "showlabels": true,
        "type": "constraint",
        "value": [0,20]
    },
}];

Here is a link to a CodePen that shows the problem. https://codepen.io/kfd182/pen/yLKvNLJ

Current behaviour (bug)

Empty plot

Expected behaviour (correct)

Plot that is entirely shaded in

Other comment

When making a contour plot that uses type=‘constraint’ and operation = ‘][’ , setting value = [data-min, data-max] creates an empty plot, instead of a completed shaded plot. If you adjust data-min to be slightly larger or adjust data-max to be slightly smaller, then you get a nearly completely shaded plot.

I think one workaround could be using {operation: '<', and value: data-min}. This will shade the entire plot area.

Reported by

kdaquila-questek

Commencez par la reproduction CodePen fournie et suivez la gestion des contours pour l’opération ][ avec la valeur [data-min, data-max]. La tâche est terminée lorsque toute la plage de données est rendue sous forme de tracé ombré au lieu d’un tracé vide, tandis que les cas limites voisins continuent de fonctionner correctement.