fix: preserve _marimo_row_id when clamping table columns (#8029)
#8035
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## Summary When a table has more columns than `max_columns` (default 50), column clamping would exclude the `_marimo_row_id` column from the data sent to the frontend. Without this column, the frontend falls back to positional indices for row identification, which breaks selection after filtering — selecting a row returns data from the wrong row. ## Fix Always include `_marimo_row_id` in the selected columns when clamping, so the frontend can use stable row IDs for correct selection regardless of column count.
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Closes #8029
When a table has more columns than
max_columns(default 50), columnclamping would exclude the
_marimo_row_idcolumn from the data sentto the frontend. Without this column, the frontend falls back to
positional indices for row identification, which breaks selection after
filtering — selecting a row returns data from the wrong row.
Fix
Always include
_marimo_row_idin the selected columns when clamping,so the frontend can use stable row IDs for correct selection regardless
of column count.