--- a/src/Pure/PIDE/rendering.scala	Fri Jan 20 19:52:52 2023 +0100
+++ b/src/Pure/PIDE/rendering.scala	Fri Jan 20 20:26:42 2023 +0100
@@ -155,7 +155,6 @@
 
   val tooltip_descriptions =
     Map(
-      Markup.CITATION -> "citation",
       Markup.TOKEN_RANGE -> "inner syntax token",
       Markup.FREE -> "free variable",
       Markup.SKOLEM -> "skolem variable",
@@ -207,8 +206,6 @@
 
   val language_elements = Markup.Elements(Markup.LANGUAGE)
 
-  val citation_elements = Markup.Elements(Markup.CITATION)
-
   val active_elements =
     Markup.Elements(Markup.DIALOG, Markup.BROWSER, Markup.GRAPHVIEW, Markup.THEORY_EXPORTS,
       Markup.SENDBACK, Markup.JEDIT_ACTION, Markup.SIMP_TRACE_PANEL)
@@ -320,14 +317,6 @@
           Some(Completion.Language_Context.inner)
       }).headOption.map(_.info)
 
-  def citations(range: Text.Range): List[Text.Info[String]] =
-    snapshot.select(range, Rendering.citation_elements, _ =>
-      {
-        case Text.Info(info_range, XML.Elem(Markup.Citation(name), _)) =>
-          Some(Text.Info(snapshot.convert(info_range), name))
-        case _ => None
-      }).map(_.info)
-
 
   /* file-system path completion */