Add id attributes to anchors of members in Scaladoc searchbar

This allows to snap to a specific member after clicking, even if it is
found under the same URL.

Author: jchyb

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

@@ -82,6 +82,7 @@ trait Locations(using ctx: DocContext):
 
   def resolveRoot(dri: DRI, path: String): String = resolveRoot(rawLocation(dri), path)
   def absolutePath(dri: DRI, extension: String = "html"): String = rawLocation(dri).mkString("", "/", s".$extension")
+  def absolutePathWithAnchor(dri: DRI, extension: String = "html"): String = s"${absolutePath(dri, extension)}#${dri.anchor}"
 
   def resolveLink(dri: DRI, url: String): String =
     if URI(url).isAbsolute then url else resolveRoot(dri, url)

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

@@ -133,7 +133,7 @@ trait Resources(using ctx: DocContext) extends Locations, Writer:
       }.mkString
 
     def mkEntry(dri: DRI, name: String, text: String, descr: String, kind: String) = jsonObject(
-        "l" -> jsonString(absolutePath(dri)),
+        "l" -> jsonString(absolutePathWithAnchor(dri)),
         "n" -> jsonString(name),
         "t" -> jsonString(text),
         "d" -> jsonString(descr),