adjustments after CR

Author: Piotr Fałdrowicz

presentation-compiler/src/main/dotty/tools/pc/completions/Completions.scala

@@ -202,9 +202,10 @@ class Completions(
       }
       .chain{ suffix =>
         adjustedPath match
-            case (ident: Ident) :: (app@Apply(_,args)) :: _ if args.size == 1  =>
+            case (ident: Ident) :: (app@Apply(_, List(arg))) :: _  =>
               app.symbol.info match
-                case mt@MethodType(termNames) if app.symbol.paramSymss.last.exists(_.is(Given)) =>
+                case mt@MethodType(termNames) if app.symbol.paramSymss.last.exists(_.is(Given)) &&
+                  !text.substring(app.fun.span.start, arg.span.end).contains("using") =>
                   suffix.withNewPrefix(Affix(PrefixKind.Using))
                 case _ => suffix    
             case _ => suffix

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

@@ -278,7 +278,7 @@ class CompletionArgSuite extends BaseCompletionSuite:
           |@main def main1(): Unit =
           |  val str = "hello"
           |  val int = 4
-          |  hello(using str, int)
+          |  hello(str, int)
           |""".stripMargin,
           assertSingleItem = false)