Editing NSTableView cells with a double-click is the default behavior. I wrote about how to make the column header cells editable already. But in order to figure out how to end an active editing session when the user hits ⌘S to save the document, I grew more and more disappointed by the day.

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When you work with view-based NSTableViews, cells by default contain a NSTextField. You can edit cell contents with them. The headers are not designed to be edited, though. You don’t have much control over the column headings from Interface Builder. So you have to build this yourself.

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