OptionalcollapseExpand up to level=depth and collapse all other branches.
Only in combination with flag == true, depth > 0.
OptionaldeepAlso collapse child nodes beyond the depth level.
Otherwise only the depth level is collapsed and the expand state of the
descendants is retained.
Only in combination with collapse and depth.
Expanding with deep option is not supported as recursion depth implied by
the depth option. However a deep option will be considered if
collapseOthers is set.
OptionaldepthRestrict expand level. Pass 0 to make only toplevel nodes visible, 1 to expand one level deeper, etc.
OptionalforceIgnore tree's minExpandLevel option
OptionalkeepKeep active node visible
OptionalloadExpand and load lazy nodes
OptionalresetUnload lazily loaded children if any (if collapsing).
Possible values for Wunderbaum.expandAll and WunderbaumNode.expandAll.