more informative FAIL message

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42183 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/common/graphcmn.cpp b/src/common/graphcmn.cpp
index ff9afe733e0a8e6acc722cdbac9a64e78897a9f3..0b9c6be864d7ea78ddc287e110c4cdb0cbdd0c1b 100644 (file)
--- a/src/common/graphcmn.cpp
+++ b/src/common/graphcmn.cpp
@@ -1126,7 +1126,7 @@ bool wxGCDC::DoBlit(
     }
     else
     {
-        wxFAIL_MSG( wxT("Blitting is only supported from bitmap contexts") );
+        wxFAIL_MSG( wxT("Blitting is only supported from bitmap contexts, and only with wxCOPY logical operation.") );
         return false;
     }