Enhance tabbed toc macro with navigation control

Now there are two variants of the macro: the default one opens links
externally, the other opens links internally

core/wiki/macros/toc.tid

@@ -163,17 +163,24 @@ tags: $:/tags/Macro
 \end
 
 \define toc-tabbed(tag,sort:"",selectedTiddler:"$:/temp/toc/selectedTiddler",unselectedText)
-<$linkcatcher to="$selectedTiddler$">
 <$tiddler tiddler={{$selectedTiddler$}}>
 <div class="tc-tabbed-table-of-contents">
+<$linkcatcher to="$selectedTiddler$">
 <div class="tc-table-of-contents">
 <$macrocall $name="toc-selective-expandable" tag="""$tag$""" sort="""$sort$""" itemClassFilter=<<toc-tabbed-selected-item-filter selectedTiddler:"""$selectedTiddler$""">>/>
 </div>
+</$linkcatcher>
 <div class="tc-tabbed-table-of-contents-content">
 <h1><$view field="caption"><$view field="title"/></$view></h1>
 <$transclude mode="block">$unselectedText$</$transclude>
 </div>
 </div>
 </$tiddler>
+\end
+
+\define toc-tabbed-internal-nav(tag,sort:"",selectedTiddler:"$:/temp/toc/selectedTiddler",unselectedText)
+<$linkcatcher to="""$selectedTiddler$""">
+<$macrocall $name="toc-tabbed" tag="""$tag$""" sort="""$sort$""" selectedTiddler="""$selectedTiddler$""" unselectedText="""$unselectedText$"""/>
 </$linkcatcher>
 \end
+

editions/tw5.com/tiddlers/demonstrations/TableOfContentsMacro Tabbed Example.tid

@@ -4,6 +4,24 @@ tags: table-of-contents-example
 
 !! Tabbed Table of Contents
 
+The tabbed table of contents macro renders a selective expandable table of contents with an attached panel that displays the currently selected tiddler.
+
+!!! Internal navigation
+
+This example shows how to construct a tabbed table of contents with internal navigation, so that clicking links in the displayed tiddler will replace the displayed tiddler.
+
 <$macrocall $name='wikitext-example-without-html'
-src='<<toc-tabbed tag:"TableOfContents" sort:"" selectedTiddler:"$:/temp/toc/selectedTiddler" unselectedText:"Select a topic in the table of contents. Click the arrow to expand a topic.">>
+src='<<toc-tabbed-internal-nav tag:"TableOfContents" selectedTiddler:"$:/temp/toc/selectedTiddler" unselectedText:"Select a topic in the table of contents. Click the arrow to expand a topic.">>
+
 '/>
+
+!!! External navigation
+
+This example shows how to construct a tabbed table of contents with external navigation, so that clicking links in the displayed tiddler will open those tiddlers in the story river in the usual way.
+
+<$macrocall $name='wikitext-example-without-html'
+src='<<toc-tabbed tag:"TableOfContents" selectedTiddler:"$:/temp/toc/selectedTiddler" unselectedText:"Select a topic in the table of contents. Click the arrow to expand a topic.">>
+
+'/>
+
+