Merge several layers into a single multi-layer GetMap request does not work with SLD Layers

[listario@…]

Checking the code in mapwmslayer.c, the parameters which are allowed to be
different between two requests in order to do the merge are LAYERS, QUERY_LAYERS
and STYLES. The SLD_BODY parameter is different in each request so the layers
are not merged. It is necessary to merge also the SLD documents into only one
and set it to the SLD_BODY parameter of the merged request (I think)

[assefa]

I think merging sld_body would be a nice enhancement. But there is still a work
around this if you define both sld_boby to be the same (and refering 2 both
layers). (Unless the sld body is built automatically by mapserver and in that
case, you end up with the original problem)
I am setting this up for future release

[listario@…]

Ok, thank you.