Debugging NSBeep Error Sound in NSResponder Method Calls

I utilize NSResponder actions in TableFlip to move the selection around. Naturally, neither a standard NSTableView nor a custom NSResponder implement default behavior for (most of) the methods I need to support arrow key movement, tab movement, and the usual shortcuts, like Cmd-Left to jump to the first cell in the current row. Or Alt + arrow keys to insert a row or column next to the selection. So I implemented this in a custom NSResponder subclass.

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