Fills the bounding rectangle in bin_window coordinates for the cell at the row specified by path and the column specified by column. If path is NULL, or points to a node not found in the tree, the y and height fields of the rectangle will be filled with 0. If column is NULL, the x and width fields will be filled with 0. The returned rectangle is equivalent to the background_area passed to CellRenderer.render. These background areas tile to cover the entire bin window. Contrast with the cell_area, returned by TreeView.getCellArea, which returns only the cell itself, excluding surrounding borders and the tree expander area.