presentation compiler: remove synthetic decorations for script wrapper

presentation-compiler/src/main/dotty/tools/pc/PcSyntheticDecorationProvider.scala

@@ -46,7 +46,7 @@ final class PcSyntheticDecorationsProvider(
 
   def provide(): List[SyntheticDecoration] =
     val deepFolder = DeepFolder[Synthetics](collectDecorations)
-    deepFolder(Synthetics.empty, tpdTree).decorations
+    deepFolder(Synthetics.empty, tpdTree).result()
 
   def collectDecorations(
       decorations: Synthetics,
@@ -256,11 +256,23 @@ case class Synthetics(
   def containsDef(offset: Int) = definitions(offset)
   def add(decoration: Decoration, offset: Int) =
     copy(
-      decorations = decoration :: decorations,
+      decorations = addDecoration(decoration),
       definitions = definitions + offset,
     )
   def add(decoration: Decoration) =
-    copy(decorations = decoration :: decorations)
+    copy (
+      decorations = addDecoration(decoration)
+    )
+
+  // If method has both type parameter and implicit parameter, we want the type parameter decoration to be displayed first,
+  // but it's added second. This method adds the decoration to the right position in the list.
+  private def addDecoration(decoration: Decoration): List[Decoration] =
+    val atSamePos =
+      decorations.takeWhile(_.range.getStart() == decoration.range.getStart())
+    (atSamePos :+ decoration) ++ decorations.drop(atSamePos.size)
+
+  def result(): List[Decoration] = decorations.reverse
+end Synthetics
 
 object Synthetics:
   def empty: Synthetics = Synthetics(Nil, Set.empty)

presentation-compiler/test/dotty/tools/pc/tests/decorations/SyntheticDecorationsSuite.scala

@@ -483,4 +483,18 @@ class SyntheticDecorationsSuite extends BaseSyntheticDecorationsSuite:
          |}
          |""".stripMargin
     )
+
+  @Test def `ord` = 
+    check(
+      """
+        |object Main {
+        |  val ordered = "acb".sorted
+        |}
+        |""".stripMargin,
+      """
+        |object Main {
+        |  val ordered: String = augmentString("acb").sorted[Char](Char)
+        |}
+        |""".stripMargin
+    )