BUG: Fixed DataFrame.combine with non-unique columns#62760

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vijmeister wants to merge 9 commits intopandas-dev:mainfrom

vijmeister:dataframe-combine-non-unique-columns

Commits on Oct 19, 2025

Fixed DataFrame.combine with non-unique columns
vijmeister
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Commits on Oct 24, 2025

Re-doing fix for Dataframe combine that works with duplicate column names.
vijmeister
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Commits on Oct 31, 2025

Merge remote-tracking branch 'upstream/main' into dataframe-combine-non-unique-columns
vijmeister
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Remove dedup_names and use column indices instead of names in DataFrame.combine.
vijmeister
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Fix logic for column access in result dictionary in DataFrame.combine.
vijmeister
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