Fix rebase breakage

Because of the trailing blanks issue in the docs it's basically impossible to do a reliable rebase.

Author: odersky

scala3doc/src/dotty/dokka/model/api/internalExtensions.scala

@@ -60,15 +60,15 @@ extension (member: Member):
     val memberWithExtra = member.asInstanceOf[WithExtraProperties[Member]]
     memberWithExtra.withNewExtras(memberWithExtra.getExtra plus ext).asInstanceOf[Member]
 
-  def copy(modifiers: Seq[Modifier]) =
+  def copy(modifiers: Seq[Modifier]): Member =
     val ext = MemberExtension.getFrom(member).getOrElse(MemberExtension.empty).copy(modifiers = modifiers)
     putInMember(ext)
 
-  def withOrigin(origin: Origin) =
+  def withOrigin(origin: Origin): Member =
     val ext = MemberExtension.getFrom(member).getOrElse(MemberExtension.empty).copy(origin = origin)
     putInMember(ext)
 
-  def withKind(kind: Kind) =
+  def withKind(kind: Kind): Member =
     val ext = MemberExtension.getFrom(member).getOrElse(MemberExtension.empty).copy(kind = kind)
     putInMember(ext)
 

scala3doc/src/dotty/dokka/translators/ScalaPageCreator.scala

@@ -36,9 +36,7 @@ class ScalaPageCreator(
   override def pageForModule(m: DModule): ModulePageNode = super.pageForModule(m)
 
   private def updatePageNameForMember(page: PageNode, p: Member) =
-    val name = p.kind match
-      case Kind.Extension(_) =>  s"extension_${page.getName}"
-      case _ => page.getName
+    val name = page.getName
 
     page.modified(name, page.getChildren)
 
@@ -164,7 +162,7 @@ class ScalaPageCreator(
 
   extension (b: DocBuilder):
     def descriptionIfNotEmpty(d: Documentable): DocBuilder = {
-      val desc = contentForDescription(d).asScala.toSeq
+      val desc = this.contentForDescription(d).asScala.toSeq
       val res = if desc.isEmpty then b else b
         .sourceSetDependentHint(
           Set(d.getDri),