Gtk.TreeViewColumn.prototype.set_expand

function set_expand(expand:Boolean):void {
    // Gjs wrapper for gtk_tree_view_column_set_expand()
}

Sets the column to take available extra space. This space is shared equally amongst all columns that have the expand set to true. If no column has this option set, then the last column gets all extra space. By default, every column is created with this false.

Along with "fixed-width", the "expand" property changes when the column is resized by the user.

Since 2.4