which column cell is changed when "row-changed" is emitted

For the signal "row-changed" of GtkTreeModel, how can I know which column cell is changed. For example, I defined 10 renderers by `gtk_cell_renderer_text_new' which means 10 columns. When column 1 and column 3 in a row are changed, the signal "row-changed" will be emitted twice. Then how can I know who emitted the change -- column 1 or column 3?

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