fix(datagrid): scope Copy as transforms to selected cells (#1929)

[datlechin]

What

Fixes #1929. When you select specific cells in the data grid, Copy as INSERT, UPDATE, JSON, CSV, and Markdown now include only the selected columns. Before, they included every column of the affected rows.

Selecting val_2.c and val_2.d, then Copy as INSERT:

-- before
INSERT INTO `myTable` (`column_a`, `column_b`, `column_c`, `column_d`) VALUES ('val_2.a', 'val_2.b', 'val_2.c', 'val_2.d');
-- after
INSERT INTO `myTable` (`column_c`, `column_d`) VALUES ('val_2.c', 'val_2.d');

Why

Plain Copy already reads the cell selection correctly. The "Copy as..." transforms collapsed the selection to row indices and rebuilt the column list from all visible columns, so which columns you selected was thrown away. This matches DataGrip's model (one selection-scoped extractor for every format) and the macOS HIG rule that a transformed Copy acts on the same selection as a plain Copy.

How

• New selectedColumnProjection() resolves the selected columns (union, display order, hidden columns excluded) when a cell selection exists, and falls back to all visible columns for a whole-row or empty selection. INSERT, JSON, CSV, and Markdown route through it.
• UPDATE gets a settableColumns set on SQLRowToStatementConverter that narrows the SET clause while the full row still feeds the WHERE. So SET narrows to the selected columns, WHERE keys on the primary key even when the primary key cell is not selected, a table with no primary key keeps identifying the row by its full contents, and a selection of only the primary key emits no statement instead of invalid SQL.
• Discontiguous selections flatten to the column-union rectangle, matching DataGrip.

Rows / With Headers (raw TSV) and IN Clause are unchanged: plain Copy already serves cell-precise TSV, and IN Clause is already single-column.

Tests

• Converter: SET restricted with the primary key in WHERE, no-primary-key full-row WHERE, primary-key-only selection emits nothing.
• Coordinator: INSERT and CSV column scoping, UPDATE SET narrowed and keyed on an unselected primary key, no-primary-key full-row WHERE, discontiguous flatten. Rewrote a prior JSON test that asserted the old all-columns output.

Docs / Changelog

• Updated the data grid "Select and Copy" docs.
• Added a Fixed entry under [Unreleased].

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[chatgpt-codex-connector]

💡 Codex Review

TablePro/TablePro/Views/Results/DataGridView+RowActions.swift

Line 164 in 8584abf

ClipboardService.shared.writeText(converter.generateUpdates(rows: typedRows))

Preserve the clipboard when no UPDATE can be generated

When the cell selection contains only the primary-key column, generateUpdates intentionally returns an empty string, but this call still invokes writeText. NSPasteboardClipboardProvider.writeText clears the system pasteboard before writing, so using Copy as UPDATE in this valid selection erases whatever the user had copied previously instead of leaving the clipboard unchanged. Guard the generated SQL for emptiness before writing it.

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