Preserve wrapper in AbstractMatrix constructor for Adjoint/Transpose

Author: jishnub

src/adjtrans.jl

@@ -332,6 +332,10 @@ wrapperop(::Transpose) = transpose
 _wrapperop(x) = wrapperop(x)
 _wrapperop(::Adjoint{<:Real}) = transpose
 
+# equivalent to wrapperop, but returns the type of the wrapper
+wrappertype(::Adjoint) = Adjoint
+wrappertype(::Transpose) = Transpose
+
 # the following fallbacks can be removed if Adjoint/Transpose are restricted to AbstractVecOrMat
 size(A::AdjOrTrans) = reverse(size(A.parent))
 axes(A::AdjOrTrans) = reverse(axes(A.parent))
@@ -391,7 +395,7 @@ similar(A::AdjOrTrans, ::Type{T}) where {T} = similar(A.parent, T, axes(A))
 similar(A::AdjOrTrans, ::Type{T}, dims::Dims{N}) where {T,N} = similar(A.parent, T, dims)
 
 # AbstractMatrix{T} constructor for adjtrans vector: preserve wrapped type
-AbstractMatrix{T}(A::AdjOrTransAbsVec) where {T} = wrapperop(A)(AbstractVector{T}(A.parent))
+AbstractMatrix{T}(A::AdjOrTransAbsVec) where {T} = wrappertype(A)(AbstractVector{T}(A.parent))
 
 # sundry basic definitions
 parent(A::AdjOrTrans) = A.parent