gtk-cell-area-context-preferred-width-for-height (context height)

context -- a gtk-cell-area-context object
height -- an integer with a proposed height for allocation

minimum-width -- an integer with the minimum width, or nil
natural-width -- an integer with the natural width, or nil

Gets the accumulative preferred width for height for all rows which have been requested for the same said height with this context.

After the function gtk-cell-area-context-reset is called and/or before ever requesting the size of a gtk-cell-area, the returned values are -1.