mike-jumper commented on issue #255: GUACAMOLE-947: Fix the initialization issue of CLIPRDR_FORMAT_LIST object URL: https://github.com/apache/guacamole-server/pull/255#issuecomment-583070859 The `msgType` field of the Format List PDU _does_ need to be set to `CLIPRDR_FORMAT_LIST` according to Microsoft's documentation for CLIPRDR; the relevant message can't be identified otherwise. The reason this wasn't done here was that the `msgType` member of FreeRDP's `CLIPRDR_FORMAT_LIST` structure was ignored by FreeRDP, with their internal handling always sending `CLIPRDR_FORMAT_LIST` regardless of what `msgType` was set to. Our implementation followed the pattern used by xfreerdp and omitted setting that property, relying instead on the known behavior of FreeRDP's functions for sending this PDU. It looks like the above has changed within FreeRDP's git master. This warning will not occur against 2.0.0-rc4 and earlier. It will occur for the xfreerdp client, as well, which appears to not have been updated to set `msgType`. Since it should be safe to set this property for older versions of FreeRDP (it will just be overwritten), I believe this change should be fine, though it's annoying that library function behavior would change like this.
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