{{- /* Nested page list for sections with subsections. Expands only the branch containing the current page. */ -}}
{{ $current := .current }}
<ul>
  {{ range .pages.ByWeight }}
  <li>
    <a href="{{ .RelPermalink }}"{{ if eq $current . }} aria-current="page"{{ end }}>{{ .LinkTitle }}</a>
    {{ if and .IsSection (or (eq $current .) ($current.IsDescendant .)) }}
      {{ with .Pages }}{{ partial "side-tree.html" (dict "pages" . "current" $current) }}{{ end }}
    {{ end }}
  </li>
  {{ end }}
</ul>