Self types appear as inherited in docs

fixes scala#13204

Author: KacperFKorban

scaladoc/src/dotty/tools/scaladoc/api.scala

@@ -155,6 +155,7 @@ case class Member(
   members : Seq[Member] = Nil,
   directParents: Seq[LinkToType] = Nil,
   parents: Seq[LinkToType] = Nil,
+  selfType: Option[LinkToType] = None,
   knownChildren: Seq[LinkToType] = Nil,
   companion: Option[DRI] = None,
   deprecated: Option[Annotation] = None,

scaladoc/src/dotty/tools/scaladoc/renderers/MemberRenderer.scala

@@ -351,12 +351,14 @@ class MemberRenderer(signatureRenderer: SignatureRenderer)(using DocContext) ext
 
       val supertypes = signatureList(m.parents)
       val subtypes = signatureList(m.knownChildren)
+      val selfType = signatureList(m.selfType.toSeq)
 
       renderTabs(
         singleSelection = true,
         Tab("Graph", "graph", graphHtml, "showGraph"),
         Tab("Supertypes", "supertypes", supertypes),
         Tab("Known subtypes", "subtypes", subtypes),
+        Tab("Self type", "selftype", selfType)
       )
 
   private def buildDocumentableFilter = div(cls := "documentableFilter")(

scaladoc/src/dotty/tools/scaladoc/tasty/ClassLikeSupport.scala

@@ -83,13 +83,18 @@ trait ClassLikeSupport:
       case (symbol, tpe) =>
         LinkToType(tpe.asSignature, symbol.dri, bareClasslikeKind(symbol))
     }
-    val selfSiangture: DSignature = typeForClass(classDef).asSignature
+    val selfType = classDef.self.map { (valdef: ValDef) =>
+      val symbol = valdef.symbol
+      val tpe = valdef.tpt.tpe
+      LinkToType(tpe.asSignature, symbol.dri, bareClasslikeKind(symbol))
+    }
+    val selfSignature: DSignature = typeForClass(classDef).asSignature
 
     val graph = HierarchyGraph.withEdges(
-      getSupertypesGraph(classDef, LinkToType(selfSiangture, classDef.symbol.dri, bareClasslikeKind(classDef.symbol)))
+      getSupertypesGraph(classDef, LinkToType(selfSignature, classDef.symbol.dri, bareClasslikeKind(classDef.symbol)))
     )
 
-    val baseMember = mkMember(classDef.symbol, kindForClasslike(classDef), selfSiangture)(
+    val baseMember = mkMember(classDef.symbol, kindForClasslike(classDef), selfSignature)(
       modifiers = modifiers,
       graph = graph,
       deprecated = classDef.symbol.isDeprecated()
@@ -227,6 +232,7 @@ trait ClassLikeSupport:
         members = classDef.extractPatchedMembers.sortBy(m => (m.name, m.kind.name)),
         directParents = classDef.getParentsAsLinkToTypes,
         parents = supertypes,
+        selfType = selfType,
         companion = classDef.getCompanion
     )