[Matplotlib-devel] Major refactor of Axes internals just merged

Paul Hobson pmhobson at gmail.com
Sat Apr 3 08:33:22 EDT 2021

Wow. Congrats on such a big milestone. Great work, Elliot. It's nuts seeing
issue #1612 closed by #18216.

I'm going to be cleaning up all of my repos at work (I found a new job) for
the next week. So I'm sure all of my CI will let me know if any big issues
come up.


On Fri, Apr 2, 2021 at 5:01 PM Thomas Caswell <tcaswell at gmail.com> wrote:

> Folks,
> We just merged a major refactor of how the Axes object stores its children
> [1].  Previously the children were stored across several lists by type and
> were sorted and merged at draw time (which is the source of the long
> standing bug [2]) whereas now there is a single list of children and
> back-compatibility shims to access the children by type.
> We expect this to be very good thing going forward, however in the short
> time we expect that there are going to be some unforeseen consequences due
> to this change.  Because of this, we held of on merging this until after we
> got 3.4 release so that we have ~6 months of this being on the default
> branch before it is released.
> If you have any issues please reach out to us!  It is unlikely that we
> will revert this change, but we will definitely extend and improve the
> shims as needed :)
> Thank you to Elliott for getting this work done!
> Tom
> [1] https://github.com/matplotlib/matplotlib/pull/18216
> [2] https://github.com/matplotlib/matplotlib/issues/1622
> --
> Thomas Caswell
> tcaswell at gmail.com
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> Matplotlib-devel at python.org
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