In Nodes 2.0 a node with a card above a picture panel gave half of its
spare height to the card. The card got empty space under its last row and
the picture was drawn at about half the size it has in the classic
renderer, on a node at its smallest size too.
Nodes 2.0 lets a widget's row take spare height whenever the widget has a
computeLayoutSize, and every DOM widget inherits one. A card that pinned
only its computeSize was pinned for the classic renderer alone.
pinVuePanelHeight clears the inherited method, and the widget cards and
Save Image's card call it. The classic renderer is unchanged.
ausboss
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