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Cells holding tabs, newlines, CRs, or quotes re-distributed across the
grid on a copy/paste cycle — the documented caveat of every tabular
clipboard milestone. This closes it on both sides:
- table_grid_tsv quotes such fields on the way out (wrapped in double
quotes, inner quotes doubled) via a new quote_tabular_field helper;
plain and empty fields stay raw, so payloads stay byte-compatible
with spreadsheets and plain text editors. The cell-range payload and
the block-span document payload share the one builder, so both
inherit the quoting at once.
- paste_table_payload replaces its split('\n')/split('\t') walk with
split_tabular_payload, an RFC-4180-style tokenizer: quotes open only
at field start (mid-field quotes are literal), doubled quotes read
as one, tabs/newlines/CRs inside quotes are literal field text,
CRLF rows outside quotes keep their tolerance, an unterminated
quote reads to the end as best effort, and a single trailing
newline adds no phantom row (a deliberate empty row survives).
- Caret parking, no-op skipping, empty-field clears, and the one-undo
grouped write semantics of the raw paste milestone are unchanged;
the caret offset in a multi-line value counts the newline too.
Tests: unit coverage for the writer and the tokenizer (every quoting
rule plus the quote/split round-trip property), runtime coverage of
copy quoting, paste restoring embedded tab/newline values verbatim
with one-undo and redo, and an end-to-end copy-cut-paste cycle; a
doc-engine materialize test pins special-character cell text
surviving peer sync and undo/redo verbatim. README caveats updated
and the milestone documented.
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