odoo/o-spreadsheet#5512

Created by BI, Hendrickx Anthony (anhe)

Blocked

label
odoo:master-chart-allow_multiples_label-anhe
head
39847410939a40e60a135130fac07f591230a21a
odoo/o-spreadsheet
master #5512 missing r+

[IMP] chart: allow multiples labels

Task Description

This PR aims to allow the usage of multiple ranges for a chart labels. This is a necessary step to have a full compatibility to the new treemap chart when switch from chart type, as well as a good way to "categorize" the labels with, for example, the first label ranges being the main category ("Art", "Sciences", ...) and the second label being the real label ("Math", "Chemistry", "Drawing", "Theatre", ...).

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