the GtkCellAreaContext which has already been requested for widths.
the GtkWidget where area will be rendering
the width for which to check the height of this area
location to store the minimum height, or NULL. out[allow-none]
location to store the natural height, or NULL. out[allow-none] Since 3.0
Retrieves a cell area's minimum and natural height if it would be given the specified width. area stores some geometrical information in context along the way while calling gtk_cell_area_get_preferred_width(). It's important to perform a series of gtk_cell_area_get_preferred_width() requests with context first and then call gtk_cell_area_get_preferred_height_for_width() on each cell area individually to get the height for width of each fully requested row. If at some point, the width of a single row changes, it should be requested with gtk_cell_area_get_preferred_width() again and then the full width of the requested rows checked again with gtk_cell_area_context_get_preferred_width().