[ruby/rdoc] Fix references to nested label in table_of_contents

Fixes https://github.com/ruby/rdoc/pull/1000

https://github.com/ruby/rdoc/commit/291e2b7e8b

lib/rdoc/generator/template/darkfish/table_of_contents.rhtml

@@ -36,7 +36,7 @@
    unless table.empty? then %>
     <ul>
 <%- table.each do |item| -%>
-      <li><a href="<%= klass.path %>#<%= item.aref %>"><%= item.plain_html %></a>
+      <li><a href="<%= klass.path %>#<%= item.label(klass) %>"><%= item.plain_html %></a>
 <%-   end -%>
     </ul>
 <%- end -%>

test/rdoc/test_rdoc_generator_darkfish.rb

@@ -113,7 +113,9 @@ class TestRDocGeneratorDarkfish < RDoc::TestCase
     refute_match(/Ignored/, File.binread('index.html'))
     summary = File.binread('index.html')[%r[<summary.*Klass\.html.*</summary>.*</details>]m]
     assert_match(%r[Klass/Inner\.html".*>Inner<], summary)
-    klassnav = File.binread('Klass.html')[%r[<div class="nav-section">.*<div id="class-metadata">]m]
+
+    klass = File.binread('Klass.html')
+    klassnav = klass[%r[<div class="nav-section">.*<div id="class-metadata">]m]
     assert_match(
       %r[<li>\s*<details open>\s*<summary>\s*<a href=\S+>Heading 1</a>\s*</summary>\s*<ul]m,
       klassnav
@@ -122,6 +124,14 @@ class TestRDocGeneratorDarkfish < RDoc::TestCase
       %r[<li>\s*<a href=\S+>Heading 1.1.1.1</a>\s*</ul>\s*</details>\s*</li>]m,
       klassnav
     )
+
+    assert_match(/<h1 id="class-Klass-label-Heading\+1">Heading 1(?!\.)/,
+                 klass[%r[<section class=\"description\">.*</section>]m])
+    toc = File.binread('table_of_contents.html')
+    assert_match(
+      %r[<a\s+href="Klass\.html#class-Klass-label-Heading\+1">Heading 1</a>]m,
+      toc[%r[<h2\s+id=\"classes\">.*(?=<h2\b)]m][%r[<a\s+href="Klass\.html".*(?=</li\b)]m]
+    )
   end
 
   def test_generate_page