[Bug 159180] Add support for refined-doughnut charts

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=159180

--- Comment #4 from Eyal Rozenberg <eyalroz1 at gmx.com> ---
(In reply to Heiko Tietze from comment #3)
> Donut charts are supported and multiple columns drawn as extra rings. Data
> from the first column come first. What exactly is missing?

You're describing the existing chart type, I'm describing a different chart
type. They both use doughnuts, but differently. Please re-read the opening
comment.

> Data from the first column come first.

In the refined-doughnut chart, there is no data in the first columns, they
contain parts of the _key_. Take the second example chart I've attached. The
rows might be:

Clothing,Shirts,sh1,10
Clothing,Shirts,sh2,10
Clothing,Shirts,sh3,8
Clothing,Pants,p1,14

etc. etc.

There is just one column of data. The doughnut rings display different levels
of aggregation.

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