event for drag&drop content in ios11

DesktopEditor/Word_Api/Editor_Defines.h

-/*
+/*
  * (c) Copyright Ascensio System SIA 2010-2017
  *
  * This program is a free software product. You can redistribute it and/or
@@ -750,6 +750,8 @@
 
 #define ASC_MENU_EVENT_TYPE_ERROR                   500
 
+#define ASC_EVENT_TYPE_DROP_OPERATION_COPY_TEXT     600
+
 #define ASC_MENU_EVENT_TYPE_COLOR_SCHEMES           2404    //  CAscColorSchemes
 #define ASC_MENU_EVENT_TYPE_CHANGE_COLOR_SCHEME     2415    //  SET(int)