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DOC: Introduce backend versions#30777

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36 changes: 36 additions & 0 deletionsgalleries/users_explain/figure/backends.rst
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Expand Up@@ -253,6 +253,42 @@ 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 commits to maintain strong backward compatibility on backends. Nevertheless,
we want to be able to evolve the backend API to support new features. Versioning the
backend API allows us to talk to backends through the API version they understand.

Backends should define a constant ``MATPLOTLIB_BACKEND_API_VERSION`` in their modules.
A missing constant is interpreted as version ``"1.0"``.

.. note::

The variable ``MATPLOTLIB_BACKEND_API_VERSION`` is currently unused, because the
detection of API version 1.1 is handled via introspection. We nevertheless
encourage third-party backends to start providing this variable as a communication
of intent.

The following backend API versions exist

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

* - API version
- Supported since
- Description
* - 1.0
- matplotlib 1.0
- The backend API has been unmodified for a long time. We retroactively declare
this the backend version 1.0
* - 1.1
- matplotlib 3.11
- `.RendererBase.draw_path_collection` gained a new optional parameter
*hatchcolor*.

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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