A Boolean value that indicates whether the outline view resizes its outline column when the user expands or collapses items.
- macOS 10.0+
The outline column contains the cells with the expansion symbols and is generally the first column. The default value of this property is
true, which causes the outline column to be resized.
The outline column is resized based on how many indentation levels are exposed or hidden. For example, if expanding a row exposes a single indentation level, the outline column width is increased by one