Widget.getPreferredWidthForHeight

void getPreferredWidthForHeight(int height, out int minimumWidth, out int naturalWidth)

Retrieves a widget’s minimum and natural width if it would be given the specified height.

The returned request will be modified by the GtkWidgetClass::adjust_size_request virtual method and by any #GtkSizeGroups that have been applied. That is, the returned request is the one that should be used for layout, not necessarily the one returned by the widget itself.

Parameters

`height`	the height which is available for allocation
`minimumWidth`	location for storing the minimum width, or null
`naturalWidth`	location for storing the natural width, or null