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