Menu: only expand active hierarchy (fixes #195)

[oldenboom]

Pull request @robhoes is on older version of theme and required some work. Reviewed those edits, then used master to redo the edits to prepare this pull request.

[seekM]

Is there a specific reason why this hasn't been merged yet?

[root360-AndreasUlm]

@oldenboom the following diff fixes the conflicts in menu.html:

diff --git a/layouts/partials/menu.html b/layouts/partials/menu.html
index 5583eda..c023003 100644
--- a/layouts/partials/menu.html
+++ b/layouts/partials/menu.html
@@ -99,18 +99,25 @@
  {{with .sect}}
   {{if and .IsSection (or (not .Params.hidden) $.showhidden)}}
     {{safeHTML .Params.head}}
+    {{ $isParent := or (.IsAncestor $currentNode) (.Params.alwaysopen) }}
+    {{ $numberOfPages := (add (len .Pages) (len .Sections)) }}
     <li data-nav-id="{{.RelPermalink}}" title="{{.Title}}" class="dd-item 
-        {{if .IsAncestor $currentNode }}parent{{end}}
+        {{if $isParent }}parent{{end}}
         {{if eq .File.UniqueID $currentFileUniqueID}}active{{end}}
-        {{if .Params.alwaysopen}}parent{{end}}
         ">
       <a href="{{.RelPermalink}}">
           {{safeHTML .Params.Pre}}{{or .Params.menuTitle .LinkTitle .Title}}{{safeHTML .Params.Post}}
+          {{ if and (ne $numberOfPages 0) (ne .Parent .Site.Home) }}
+            {{if $isParent }}
+              <i class="fas fa-caret-down"></i>
+            {{ else }}
+              <i class="fas fa-caret-right"></i>
+            {{ end }}
+          {{ end }}
           {{ if $showvisitedlinks}}
-            <i class="fas fa-check read-icon"></i>
+            <i class="fas fa-check"></i>
           {{ end }}
       </a>
-      {{ $numberOfPages := (add (len .Pages) (len .Sections)) }}
       {{ if ne $numberOfPages 0 }}
         <ul>
           {{ $currentNode.Scratch.Set "pages" .Pages }}