Added extra hit test style for more accurate reporting

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44329 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtext/richtextbuffer.h

@@ -139,6 +139,8 @@ class WXDLLIMPEXP_RICHTEXT wxRichTextBuffer;
 #define wxRICHTEXT_HITTEST_AFTER    0x04
 // The point was on the position returned from HitTest
 #define wxRICHTEXT_HITTEST_ON       0x08
+// The point was on space outside content
+#define wxRICHTEXT_HITTEST_OUTSIDE  0x10
 
 /*!
  * Flags for GetRangeSize