Gtk.TreeViewColumn.prototype.set_max_width

function set_max_width(max_width:Number):void {
    // Gjs wrapper for gtk_tree_view_column_set_max_width()
}

Sets the maximum width of the tree_column. If max_width is -1, then the maximum width is unset. Note, the column can actually be wider than max width if it's the last column in a view. In this case, the column expands to fill any extra space.