Bug 1572864 - Backed out changeset 1c5dad422769 to make way for a different solution. a=backout

mailnews/compose/src/nsMsgCompose.cpp

@@ -265,12 +265,7 @@ bool nsMsgCompose::IsEmbeddedObjectSafe(const char *originalScheme,
           nsAutoCString path;
           rv = uri->GetPathQueryRef(path);
           if (NS_SUCCEEDED(rv)) {
-            // For mailbox: and JS Account URLs, the original path contains
-            // ?number=NN, so let's transfer this over before comparing.
-            nsCString msgNumber = MsgExtractQueryPart(path, "number=");
             MsgRemoveQueryPart(path);
-            if (!msgNumber.IsEmpty())
-              path += NS_LITERAL_CSTRING("?") + msgNumber;
             // If this object is a part of the original message, we can send it
             // safely.
             return path.Equals(originalPath,