the width which is available for allocation, or -1 if none
location for storing the minimum height, or NULL. out[allow-none]
location for storing the natural height, or NULL. out[allow-none]
location for storing the baseline for the minimum height, or NULL. out[allow-none]
location for storing the baseline for the natural height, or NULL. out[allow-none] Since 3.10
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Retrieves a widget's minimum and natural height and the corresponding baselines if it would be given the specified width, or the default height if width is -1. The baselines may be -1 which means that no baseline is requested for this widget. The returned request will be modified by the GtkWidgetClass::adjust_size_request and GtkWidgetClass::adjust_baseline_request virtual methods 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.