Mixing triming and slicing in WCPS fails

[Dimitar Misev]

The query below fails with error from the parser

line 3:10 mismatched input '[' expecting COMMA

for    c in ( NDVI_AMAZON )
return
encode( c[t(5),x(0:20),y(0:20)] , "png" )

a quick separate the slicing and triming like this:

for c in ( NDVI_AMAZON )
return
encode ( (c[x(0:20),y(0:20)])[t(0)] , "png" )