Causes the minimum and/or natural width to grow if the new
proposed sizes exceed the current minimum and natural width.
This is used by GtkCellAreaContext implementations during
the request process over a series of GtkTreeModel rows to
progressively push the requested width over a series of
gtk_cell_area_get_preferred_width() requests.
Causes the minimum and/or natural width to grow if the new proposed sizes exceed the current minimum and natural width. This is used by GtkCellAreaContext implementations during the request process over a series of GtkTreeModel rows to progressively push the requested width over a series of gtk_cell_area_get_preferred_width() requests.