Invoked when the insertion point tries to leave a cell of the control that has been edited.
Original signature is '- (BOOL)control:(NSControl *)control textShouldEndEditing:(NSText *)fieldEditor'
Available in Mac OS X v10.0 and later.

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YES if the insertion point should be allowed to end the editing session; otherwise, NO.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)