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
location to store the natural height, or %NULL
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().