highlight *all* the tree nodes in the hovered node stack, including those which aren't parents of the innermost node.
highlight *all* the tree nodes in the hovered node stack, including those which aren't parents of the innermost node.

(e.g. the text nodes which reference a macro will now also get highlighted)

refs #76

fbennett/csl-editor,adam3smith/csl-editor,citation-style-language/csl-editor,citation-style-editor/csl-editor,adam3smith/csl-editor,citation-style-language/csl-editor,adam3smith/csl-editor,citation-style-editor/csl-editor,fbennett/csl-editor,citation-style-language/csl-editor,citation-style-editor/csl-editor