Fix breadcrumbs and add tests

Author: romanowski

scala3doc/src/dotty/renderers/HtmlRenderer.scala

@@ -163,7 +163,7 @@ class HtmlRenderer(rootPackage: Member, val members: Map[DRI, Member])(using ctx
 
     val parentsHtml =
       val innerTags = parents.flatMap[TagArg](b => Seq(
-          a(href := pathToPage(b.dri, link.dri))(b.name),
+          a(href := pathToPage(link.dri, b.dri))(b.name),
           "/"
         )).dropRight(1)
       div(cls := "breadcrumbs")(innerTags:_*)

scala3doc/test/dotty/dokka/site/SiteGeneratationTest.scala

@@ -72,6 +72,12 @@ class SiteGeneratationTest extends BaseHtmlTest:
     withHtmlFile("docs/Adoc.html"){ content  =>
         content.assertAttr("p a","href", "../api/tests/site/SomeClass.html")
     }
+
+    withHtmlFile("api/tests/site/SomeClass.html"){ content  =>
+      content.assertAttr(".breadcrumbs a","href",
+        "../../../docs/index.html", "../../index.html", "../site.html", "SomeClass.html"
+      )
+    }
   }
 
   @Test