markers: avoid unnecessary stack depth

[radoering]

This is a slight performance optimization and preliminary work for improvements to union_simplify and intersect_simplify. The SingleMarker branch finally ends in the multi/union branch via some function calls anyway, so we can shortcut it by checking for multi/union markers first.

Related to: python-poetry/poetry#10249

• Added tests for changed code.
• Updated documentation for changed code.

Summary by Sourcery

Enhancements:

• Optimize marker intersection and union operations by prioritizing checks for MultiMarker and MarkerUnion instances.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request optimizes marker intersection and union operations by prioritizing simplification of MarkerUnion and MultiMarker types, respectively, before handling SingleMarkerLike types. This change reduces stack depth and improves performance. It also lays groundwork for future improvements to union_simplify and intersect_simplify.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Optimize marker intersection by prioritizing MarkerUnion simplification.	Moved the MarkerUnion simplification check before the SingleMarkerLike check in the intersection logic. Added a flag to prevent redundant checks when one of the markers is a MarkerUnion.	src/poetry/core/version/markers.py
Optimize marker union by prioritizing MultiMarker simplification.	Moved the MultiMarker simplification check before the SingleMarkerLike check in the union logic. Added a flag to prevent redundant checks when one of the markers is a MultiMarker.	src/poetry/core/version/markers.py

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[sourcery-ai]

Hey @radoering - I've reviewed your changes - here's some feedback:

Overall Comments:

• It might be clearer to move the is_one_union and is_one_multi checks directly into the if conditions to improve readability.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟡 Complexity: 1 issue found
• 🟢 Documentation: all looks good

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