Gtk.TreeViewColumn.prototype.cell_get_size

function cell_get_size(cell_area:Gdk.Rectangle):void {
    // Gjs wrapper for gtk_tree_view_column_cell_get_size()
}

Obtains the width and height needed to render the column. This is used primarily by the Gtk.TreeView.

cell_area

The area a cell in the column will be allocated, or null