When an NSTableView is set up with bindings and NSArrayController,
what is the right way to modify a row? I see NSArrayController
methods to add and remove objects, but nothing to modify one. I guess
I could remove and then add, but that seems ugly.
Before I started with bindings, it wasn't a problem. The model array
for the table was an NSMutableArrray of NSMutableDictionary, so I
could just find the dictionary for the row and update it. But
apparently [[ arrayController arrangedObjects] objectAtIndex: i ]
returns an immutable dictionary, so I can't do it that way. I can't
see how to work with the model array directly any more, because any
way I get indexes of selected items gives indexes into the arranged
objects, not the original array.
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