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DOC: Introduce backend versions #30777

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29 changes: 29 additions & 0 deletions galleries/users_explain/figure/backends.rst
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Expand Up @@ -253,6 +253,35 @@ backend, use ``module://name.of.the.backend`` as the backend name, e.g.

Information for backend implementers is available at :ref:`writing_backend_interface`.

Backend API versions
--------------------
Matplotlib aims to maintain backward compatibility on backends. Nevertheless, we
want to be able to evolve the backend API to support new features. Defining backend
API versions will help to communicate which API is supported by a given version of
Matplotlib.

The following backend API versions exist

.. list-table::
:header-rows: 1

* - API version
- Supported since
- Description
* - 1.0
- Matplotlib 3.10
- This is the starting point for systematic definition of backend versions.
Most of the API will work far back, but there is no benefit in retroactively
uncovering all prior the changes.
* - 1.1
- Matplotlib 3.11
- `.RendererBase.draw_path_collection` gained a new optional parameter
*hatchcolor*. The presence of the parameter is inferred by introspection, so
that matplotlib 3.11+ will still work with backends implementing API version
1.0.

There is currently no plan to remove support for older API versions.

.. _figures-not-showing:

Debugging the figure windows not showing
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