<itemvalue="Convert the given point from the local coordinate system for this box to the global coordinate system in logical pixels. If `ancestor` is non-null, this function converts the given point to the coordinate system of `ancestor` (which must be an ancestor of this render object) instead of to the global coordinate system. This method is implemented in terms of [getTransformTo]. If the transform matrix puts the given `point` on the line at infinity (for instance, when the transform matrix is the zero matrix), this method returns (NaN, NaN)."/>
<itemvalue="Vertical viewport was given unbounded height. Viewports expand in the scrolling direction to fill their container. In this case, a vertical viewport was given an unlimited amount of vertical space in which to expand. This situation typically happens when a scrollable widget is nested inside another scrollable widget. If this widget is always nested in a scrollable widget there is no need to use a viewport because there will always be enough vertical space for the children. In this case, consider using a Column instead. Otherwise, consider using the "shrinkWrap" property (or a ShrinkWrappingViewport) to size the height of the viewport to the sum of the heights of its children."/>
