Apply Layout is lazy for ConstRows

Author: dlfivefifty

src/InfiniteLinearAlgebra.jl

@@ -12,8 +12,8 @@ import BandedMatrices: BandedMatrix, _BandedMatrix, AbstractBandedMatrix, banded
 import LinearAlgebra: lmul!,  ldiv!, matprod, qr, AbstractTriangular, AbstractQ, adjoint, transpose
 import LazyArrays: applybroadcaststyle, CachedArray, CachedMatrix, CachedVector, DenseColumnMajor, FillLayout, ApplyMatrix, check_mul_axes, ApplyStyle, LazyArrayApplyStyle, LazyArrayStyle,
                     CachedMatrix, CachedArray, resizedata!, MemoryLayout, mulapplystyle, LmulStyle, RmulStyle,
-                    colsupport, rowsupport, triangularlayout, factorize, subarraylayout, sub_materialize,
-                    @lazymul, ApplyLayout, TriangularLayout, PaddedLayout, materialize!, MatLdivVec, triangulardata
+                    colsupport, rowsupport, triangularlayout, factorize, subarraylayout, sub_materialize, LazyLayout,
+                    @lazymul, applylayout, ApplyLayout, TriangularLayout, PaddedLayout, materialize!, MatLdivVec, triangulardata
 import MatrixFactorizations: ql, ql!, QLPackedQ, getL, getR, reflector!, reflectorApply!, QL, QR, QRPackedQ
 
 import BlockArrays: BlockSizes, cumulsizes, _find_block, AbstractBlockVecOrMat, sizes_from_blocks

src/banded/infbanded.jl

@@ -296,6 +296,7 @@ for Typ in (:ConstRows, :PertConstRows)
     @eval begin
         subarraylayout(::$Typ, ::Type{<:Tuple{Any,AbstractInfUnitRange{Int}}}) = $Typ() # no way to lose const rows
         applybroadcaststyle(::Type{<:AbstractMatrix}, ::$Typ) = LazyArrayStyle{2}()
+        applylayout(::Type, ::$Typ, _...) = LazyLayout()
     end
 end