Don't wrap ConversionWrapper twice (#381)

Author: jishnub

Project.toml

@@ -1,6 +1,6 @@
 name = "ApproxFunBase"
 uuid = "fbd15aa5-315a-5a7d-a8a4-24992e37be05"
-version = "0.7.71"
+version = "0.7.72"
 
 [deps]
 AbstractFFTs = "621f4979-c628-5d54-868e-fcf4e3e8185c"

src/Operators/banded/Conversion.jl

@@ -82,6 +82,7 @@ end
 ConversionWrapper(::Type{T},op) where {T} = ConversionWrapper{typeof(op),T}(op)
 ConversionWrapper(B::Operator) =
     ConversionWrapper{typeof(B),eltype(B)}(B)
+ConversionWrapper(C::ConversionWrapper) = C
 Conversion(A::Space,B::Space,C::Space) =
     ConversionWrapper(Conversion(B,C)*Conversion(A,B))
 Conversion(A::Space,B::Space,C::Space,D::Space...) =