add test, remove additional whitespace

Author: rochala

compiler/src/dotty/tools/dotc/interactive/Completion.scala

@@ -94,7 +94,7 @@ object Completion:
    * Inspect `path` to determine the completion prefix. Only symbols whose name start with the
    * returned prefix should be considered.
    */
-  def completionPrefix(path: List[untpd.Tree],  pos: SourcePosition)(using Context): String =
+  def completionPrefix(path: List[untpd.Tree], pos: SourcePosition)(using Context): String =
     path match
       case (sel: untpd.ImportSelector) :: _ =>
         completionPrefix(sel.imported :: Nil, pos)

presentation-compiler/test/dotty/tools/pc/tests/completion/CompletionSuite.scala

@@ -1442,3 +1442,14 @@ class CompletionSuite extends BaseCompletionSuite:
          |""".stripMargin
     )
 
+
+  @Test def `no-square-brackets` =
+    checkEdit(
+      """|object O:
+         |  val a = List.appl@@
+         |""".stripMargin,
+      """|object O:
+         |  val a = List.apply($0)
+         |""".stripMargin,
+    )
+