bugfix: Fix nn missing in Completions

Author: tgodzik

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

@@ -76,7 +76,7 @@ class Completions(
         if appl.fun == funSel && sel == fun => false
       case _ => true) &&
       (adjustedPath match
-        /* In case of `class X derives TC@@` we shouldn't add `[]` 
+        /* In case of `class X derives TC@@` we shouldn't add `[]`
          */
         case Ident(_) :: (templ: untpd.DerivingTemplate) :: _ =>
           val pos = completionPos.toSourcePosition
@@ -213,11 +213,11 @@ class Completions(
             case (ident: Ident) :: (app@Apply(_, List(arg))) :: _  =>
               app.symbol.info match
                 case mt@MethodType(termNames) if app.symbol.paramSymss.last.exists(_.is(Given)) &&
-                  !text.substring(app.fun.span.start, arg.span.end).contains("using") =>
+                  !text.substring(app.fun.span.start, arg.span.end).nn.contains("using") =>
                   suffix.withNewPrefix(Affix(PrefixKind.Using))
-                case _ => suffix    
+                case _ => suffix
             case _ => suffix
-        
+
       }
       .chain { suffix => // for () suffix
         if shouldAddSuffix && symbol.is(Flags.Method) then