Defines a new undo element format (fun .
args), which means “undo by applying
fun to args”. For spreadsheet
buffers, it allows undos in the data area even though that's
outside the narrowing.
copy-region-as-kill
When copying from the print area of a spreadsheet, treat
the region as a rectangle and attach each cell's formula and
printer as 'ses properties.
yank
When yanking into the print area of a spreadsheet, first
try to yank as cells (if the yank text has 'ses properties),
then as tab-separated formulas, then (if all else fails) as a
single formula for the current cell.