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Merged
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Aug 24, 2020
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Rewrite of constrained_layout.... #17494

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25 changes: 25 additions & 0 deletions doc/api/next_api_changes/behavior/17494-JMK.rst
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Constrained layout rewrite
~~~~~~~~~~~~~~~~~~~~~~~~~~

The layout manager ``constrained_layout`` was re-written with different
outer constraints that should be more robust to complicated subplot layouts.
User-facing changes are:

- some poorly constrained layouts will have different width/height plots than
before.
- colorbars now respect the ``anchor`` keyword argument of
`matplotlib.colorbar.make_axes`
- colorbars are wider.
- colorbars in different rows or columns line up more robustly.
- *hspace* and *wspace* options to `.Figure.set_constrained_layout_pads`
were twice as wide as the docs said they should be. So these now follow
the docs.

This feature will remain "experimental" until the new changes have been
used enough by users, so we anticipate version 3.5 or 3.6. On the other hand,
``constrained_layout`` is extensively tested and used in examples in the
library, so using it should be safe, but layouts may not be exactly the same
as more development takes place.

Details of using ``constrained_layout``, and its algorithm are available at
:doc:`/tutorials/intermediate/constrainedlayout_guide`
1,070 changes: 507 additions & 563 deletions lib/matplotlib/_constrained_layout.py
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