Description

Changing layout.ternary.sum with Plotly.relayout does not recalculate scatterternary data.

But scatterternary/calc.js depends on ternary.sum both to infer a missing component and to normalize a, b, and c. However, layout.ternary.sum currently has editType: 'plot', so changing it redraws the subplot without recalculating the trace.

For example, with:

a: [0.2],
b: [0.3]

and the default ternary.sum: 1, c is inferred as 0.5.

After:

Plotly.relayout(gd, {
  'ternary.sum': 100
});

the expected inferred value is 99.5, but the existing calcdata remains based on c = 0.5.

Codepen

https://codepen.io/Lexachoc/pen/EaWEpLx

Expected

Changing ternary.sum should recalculate ternary trace data.