I have a bunch of instrument objects, each of which has a to-many
relationship to calibration points. (A calibration point has two
attributes: "indicated" and "actual", but that's not really important.)
instrument -->> calibrationData
The instruments are displayed in a table view. A button runs a sheet
to edit the calibration data of the selected instrument in a table
view. When the sheet is running, the undo menu item is dimmed, so I
can't undo object insertions/deletions/edits while the sheet is
running. When the sheet is closed, the undo menu item is enabled
again, and selecting undo will undo the changes made in the sheet one
by one, but of course, you can't see this unless you run the sheet
again.
How can I make (Core Data's) undo work in the sheet?
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