Collapse one or more groups. The MergingFoldingEdgeConverter will merge
the edges such that only one edge connects any node connected to the folder node. The
label on the edge indicates how many edges were merged.
Add additional nodes to the groups by entering the respective group. Add edges between
nodes of separate group nodes and see the incrementing edge count.
Add new groups and edges between child nodes.
GraphEditorInputMode provides the following default gestures for
collapse/expand:
Press Alt + LeftArrow or click the expand-button on the node's top
left corner to close (collapse) an open group node.
Press Alt + RightArrow or click the collapse-button on the node's
top left corner to open (expand) a closed group node.
Press Alt + DownArrow to enter (navigate into) a group node.
Press Alt + UpArrow to exit (navigate out of) a group node.