Determine the number of levels in a viewport stack or tree, in a viewport path, or in a grob path.
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Typically a viewport or viewport stack or viewport tree or viewport list, or a viewport path, or a grob path.
Arguments used by other methods.
Depths of paths are pretty straightforward because they contain no branchings. The depth of a viewport stack is the sum of the depths of the components of the stack. The depth of a viewport tree is the depth of the parent plus the depth of the children. The depth of a viewport list is the depth of the last component of the list.
An integer value.
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