Resolvelib

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Features
--------

- Add ``backtrack_causes`` to ``get_preference``, which contains information
about the requirements involved in the most recent backtrack. This allows
the provider to utilise this information to tweak the ordering as well as
for recording/reporting conflicts.

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Bug Fixes
---------

- When merging a candidate's dependencies, make sure the merge target is
up-to-date within the loop, so the merge does not lose information when a
candidate returns multiple dependency specifications under one identifier
(e.g. specifyiung two dependencies ``a>1`` and ``a<2``, instead of one single
``a>1,<2`` dependency). `80 <https://github.com/sarugaku/resolvelib/issues/80>`_

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Features
--------

- Redesign ``get_preference()`` to include resolution state on dependencies
other than the currently working one, to allow the provider to better take
account of the global resolver knowledge and determine the best strategy. The
provider now can, for example, correctly calculate how far a dependency is
from the root node in the graph. `74 <https://github.com/sarugaku/resolvelib/issues/74>`_

==================

Features
--------

- A new argument ``incompatibilities`` is now passed to the ``find_matches()``
hook, which the provider must use to exclude matches from the return value. `68 <https://github.com/sarugaku/resolvelib/issues/68>`_

- Redesign ``find_matches()`` to include resolution state on dependencies other
than the currently working one, to handle usages that need to return candidates
based on non-local states. One such example is PEP 508 direct URLs specified
on a package, which need to be available to the same package specified with
extras (which would have a different identifier). `74 <https://github.com/sarugaku/resolvelib/issues/74>`_


Bug Fixes
---------

- The resolver no longer relies on implicit candidate equality to detect
incompatibilities. This is done by an additional ``find_matches()`` argument;
see the *Features* section to learn more. `68 <https://github.com/sarugaku/resolvelib/issues/68>`_

==================

Features
--------

- Provide type stubs for most classes. `72 <https://github.com/sarugaku/resolvelib/issues/72>`_

==================

No significant changes.