ENH: speed up wide DataFrame.line plots by using a single LineCollection#61764

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EvMossan wants to merge 10 commits intopandas-dev:mainfrom

EvMossan:plot-linecollection-speedup

Commits on Jul 6, 2025

STYLE: apply ruff / isort auto-formatting on core.py
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TST: use default_rng to satisfy Ruff NPY002
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DOC: add Performance improvement bullet for LineCollection speed-up
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TST: skip speedup test when matplotlib is not installed
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DOC: whatsnew entry for LineCollection speed-up
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REF: unify _make_plot; single path with LineCollection option
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DOC: whatsnew entry for LineCollection speed-up
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TYP: silence mypy warnings in unified _make_plot
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TYP: align ignore hints after line shifts; drop unused ignore
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MAINT: replace ambiguous space in plotting docstring
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