Fix shift-enter behavior

If completion and brace completion are both active, shift-enter should
commit both and complete the statement. This was not working because the
completion command handler never called next handler for shift-enter and
the line ender command handler was not ordered correctly.

Fixes dotnet#18065

src/EditorFeatures/Core/Implementation/IntelliSense/Completion/Controller_AutomaticLineEnder.cs

@@ -30,8 +30,9 @@ void ICommandHandler<AutomaticLineEnderCommandArgs>.ExecuteCommand(AutomaticLine
             if (!committed)
             {
                 this.DismissSessionIfActive();
-                nextHandler();
             }
+
+            nextHandler();
         }
     }
 }

src/EditorFeatures/VisualBasic/AutomaticCompletion/AutomaticLineEnderCommandHandler.vb

@@ -14,7 +14,7 @@ Namespace Microsoft.CodeAnalysis.Editor.VisualBasic.AutomaticCompletion
     ' visual basic automatic line ender command handler
     ' </summary>
     <ExportCommandHandler(PredefinedCommandHandlerNames.AutomaticLineEnder, ContentTypeNames.VisualBasicContentType)>
-    <Order(Before:=PredefinedCommandHandlerNames.Completion)>
+    <Order(After:=PredefinedCommandHandlerNames.Completion)>
     Friend Class AutomaticLineEnderCommandHandler
         Inherits AbstractAutomaticLineEnderCommandHandler