Invoked to allow the delegate to provide custom sizing behavior when a column’s resize divider is double clicked.
Original signature is '- (CGFloat)outlineView:(NSOutlineView *)outlineView sizeToFitWidthOfColumn:(NSInteger)column'
Available in Mac OS X v10.6 and later.

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public delegate CGFloat OutlineViewSizeToFitWidthOfColumnEventHandler( NSOutlineView outlineView, NSInteger column )
Public Delegate Function OutlineViewSizeToFitWidthOfColumnEventHandler ( _ outlineView As NSOutlineView, _ column As NSInteger _ ) As CGFloat
public delegate CGFloat OutlineViewSizeToFitWidthOfColumnEventHandler( NSOutlineView^ outlineView, NSInteger column )

- outlineView (NSOutlineView)
- The outline view that sent the message.
- column (NSInteger)
- The index of the column.

The width of the specified column.

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