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5
column is selected for sorting.
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6
See \code{\link{gtkTreeViewColumnSetSortColumnId}}.}
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7
\usage{gtkTreeViewColumnGetSortColumnId(object)}
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\value{[integer] the current \code{sort.column.id} for this column, or -1 if
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10
this column can't be used for sorting.}
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\author{Derived by RGtkGen from GTK+ documentation}