fix: pc functions for multiline strings in worksheets in scala 3

Author: kasiaMarek

metals/src/main/scala/scala/meta/internal/worksheets/WorksheetProvider.scala

@@ -498,9 +498,8 @@ object WorksheetProvider {
       originInput: Input.VirtualFile
   ): Option[(Input.VirtualFile, AdjustLspData)] = {
     val ident = "  "
-    val withOuter = s"""|object worksheet{
-                        |$ident${originInput.value.replace("\n", "\n" + ident)}
-                        |}""".stripMargin
+    val withOuter =
+      s"""object worksheet{\n$ident${originInput.value.replace("\n", "\n" + ident)}\n}"""
     val modifiedInput =
       originInput.copy(value = withOuter)
     val adjustLspData = AdjustedLspData.create(

tests/unit/src/main/scala/tests/BaseWorksheetLspSuite.scala

@@ -400,6 +400,37 @@ abstract class BaseWorksheetLspSuite(
     } yield ()
   }
 
+  test("multi-line-string") {
+    cleanWorkspace()
+    val tripleQuotes = (1 to 3).map(_ => '"').mkString
+    for {
+      _ <- initialize(
+        s"""|/metals.json
+            |{"a": {"scalaVersion": "$scalaVersion"}}
+            |/a/src/main/scala/Main.worksheet.sc
+            |s${tripleQuotes}|# Spear $${2.max(1)}
+            ||smth: $${9.max(8)}
+            ||${tripleQuotes}.stripMargin
+            |""".stripMargin
+      )
+      _ <- server.didOpen("a/src/main/scala/Main.worksheet.sc")
+      _ = assertNoDiagnostics()
+      max <- server.completion(
+        "a/src/main/scala/Main.worksheet.sc",
+        s"|smth: $${9.max@@",
+      )
+      // completions work despite error
+      _ = assertNoDiff(
+        max,
+        s"""|max(that: Double): Double
+            |max(that: Float): Float
+            |max(that: Int): Int
+            |max(that: Long): Long
+            |""".stripMargin,
+      )
+    } yield ()
+  }
+
   test("update-classpath") {
     cleanWorkspace()
     for {