BUG: Fix bug in DataFrame binary op not respecting fill_value in case… #60906
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… of MultiIndex columns
doc/source/whatsnew/vX.X.X.rstfile if fixing a bug or adding a new feature.When
fill_valueis not None, we should not reindex the dataframes, as the_arith_method_with_reindexmethod doesn't handlefill_value. Instead, we should go via the regular_flex_arith_methodroute as reindexing is no longer necessary whenfill_valueis provided.Bug introduced in #60538 so not adding to whatsnew.