[datlechin]

Summary

• Ctrl+V in a table tab's grid, and Paste in the cell menu and below the rows, add the clipboard's rows as pending new rows: one undo step, selected once added. Save, Discard, undo and redo work as for Insert Row.
• Values fill the columns as the grid shows them, from the focused one, or by name under a header line. Each is read as a cell edit reads it.
• Generated and auto-increment columns, a key the server fills, and binary, spatial, array and composite columns keep what a new row holds. A toast counts the values left out.
• One value with a cell focused edits that cell, as typing it would. A value a column refuses stops the paste with an alert naming the line, the column and why.
• A read-only connection, or a table or view with no primary key, refuses with a toast. Above 1,000 rows the paste asks first and points to Import CSV; above 100,000 lines, or 2,000,000 cells across the table's columns, it refuses.
• Grid copies now offer their cells beside the text (application/x-tablepro-cells+json), so a NULL, the text NULL, quotes and line breaks paste back exactly, rows land in the columns they came from, and a number or bytes in a SQLite column of no declared type keeps its storage class. Text from a spreadsheet or another app is read as tab-separated values, NULL as NULL.
• Paste Rows (Ctrl+V) is listed in Keyboard Shortcuts.
• Fixed: Duplicate of several rows showed the copies in reverse order, on screen and after a refresh.
• Fixed: the CSV import's error alert quoted the whole refused value, however long. It now quotes 80 characters, shared with the paste's alert.
• Differs from the issue: a key the server cannot fill takes the pasted value instead of DEFAULT, since DEFAULT there fails every save.
• New conformance case tsv_copy_pastes_back_as_the_same_rows copies the value corpus as text and as cells, pastes and saves it, on every engine, comparing kinds for the cells.

Test plan

• tablepro-core: import::pasted_table (quoting, CRLF, blank lines, header, NULL, skipped values, column order, refused values, copied cells, caps).
• tablepro: ui::browse_tab::tests::paste (Ctrl+V at the focused cell, cell menu, shown column order, header, one value, refusals, large paste question, undo and redo, exact round trip of grid copies, duplicate order after a refresh), error_text quoting, shortcuts dialog.
• tsv_copy_pastes_back_as_the_same_rows on SQLite.

Screenshots

Before, Ctrl+V and the cell menu on main.

Ctrl+V with a cell focused: three rows from a spreadsheet, header mapped by name, added and selected.

Paste in the cell menu.

A value the column refuses.

Above 1,000 rows.

Keyboard Shortcuts.

Fixes #3649