negative bandwidth in interlace operator

[jishnub]

On master

julia> Derivative(Chebyshev() + Legendre())
DerivativeWrapper : Chebyshev() ⊕ Legendre() → Ultraspherical(1) ⊕ Jacobi(1,1)
 0.0  0.0  1.0   ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅   0.0  0.0  1.0   ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅   0.0  0.0  2.0   ⋅    ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅   0.0  0.0  1.5   ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅   0.0  0.0  3.0   ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅   0.0  0.0  2.0   ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   0.0  0.0  4.0   ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   0.0  0.0  2.5  ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   0.0  0.0  ⋱
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   0.0  ⋱
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋱

With this,

julia> Derivative(Chebyshev() + Legendre())
DerivativeWrapper : Chebyshev() ⊕ Legendre() → Ultraspherical(1) ⊕ Jacobi(1,1)
  ⋅    ⋅   1.0   ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅   1.0   ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅   2.0   ⋅    ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅   1.5   ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   3.0   ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   2.0   ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   4.0   ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   2.5  ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋱
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋅
  ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅    ⋅   ⋅

[codecov]

Codecov Report

Patch coverage: 13.15% and project coverage change: -0.05% ⚠️

Comparison is base (c31337a) 27.53% compared to head (a277049) 27.48%.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #575      +/-   ##
==========================================
- Coverage   27.53%   27.48%   -0.05%     
==========================================
  Files          80       80              
  Lines        8379     8390      +11     
==========================================
- Hits         2307     2306       -1     
- Misses       6072     6084      +12     

Files Changed	Coverage Δ
src/Operators/Operator.jl	51.98% <0.00%> (ø)
src/Operators/banded/CalculusOperator.jl	17.21% <0.00%> (ø)
src/Spaces/SumSpace.jl	31.98% <0.00%> (ø)
src/specialfunctions.jl	16.77% <0.00%> (ø)
src/Operators/general/InterlaceOperator.jl	22.95% <20.00%> (-0.52%)	⬇️

... and 2 files with indirect coverage changes

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