fix: insert missing members in correct place for case classes

Author: kasiaMarek

mtags/src/main/scala-3/scala/meta/internal/pc/completions/OverrideCompletions.scala

@@ -509,6 +509,8 @@ object OverrideCompletions:
     defn match
       case td: TypeDef if text.charAt(td.rhs.span.end) == ':' =>
         Some(td.rhs.span.end)
+      case TypeDef(_, temp : Template) =>
+        temp.parentsOrDerived.lastOption.map(_.span.end).filter(text.charAt(_) == ':')
       case _ => None
 
   private def fallbackFromParent(parent: Tree, name: String)(using Context) =

tests/cross/src/test/scala/tests/pc/AutoImplementAbstractMembersSuite.scala

@@ -1271,6 +1271,35 @@ class AutoImplementAbstractMembersSuite extends BaseCodeActionSuite {
        |""".stripMargin
   )
 
+  checkEdit(
+    "braceless-case-class".tag(IgnoreScala2),
+    """|package a
+       |
+       |trait Base:
+       |  def foo(x: Int): Int
+       |  def bar(x: String): String
+       |
+       |case class <<Concrete>>() extends Base:
+       |  def aaa = "aaa"
+       |end Concrete
+       |""".stripMargin,
+    """|package a
+       |
+       |trait Base:
+       |  def foo(x: Int): Int
+       |  def bar(x: String): String
+       |
+       |case class Concrete() extends Base:
+       |
+       |  override def bar(x: String): String = ???
+       |
+       |  override def foo(x: Int): Int = ???
+       |
+       |  def aaa = "aaa"
+       |end Concrete
+       |""".stripMargin
+  )
+
   def checkEdit(
       name: TestOptions,
       original: String,