Julia 1.7.3 breaks Gradient and RF hcat

[cncastillo]

When running a function that uses ;; to concatenate, like:

RF_hard(B1, T, sys::Scanner; G=[0,0,0]) = begin
	ζ = sum(G) / sys.Smax
	EX = Sequence([	Grad(G[1],T,ζ);	 #Gx
					Grad(G[2],T,ζ);  #Gy
					Grad(G[3],T,ζ);;], #Gz
					 [RF(B1,T,0,ζ)]	 #RF
					)
	EX
end

Julia 1.7.3 throws an error:

julia> PulseDesigner.RF_hard(1.,1.,Scanner())
ERROR: MethodError: no method matching size(::Grad, ::Int64)
Closest candidates are:
  size(::Union{LinearAlgebra.QR, LinearAlgebra.QRCompactWY, LinearAlgebra.QRPivoted}, ::Integer) at /opt/julia-1.7.3/share/julia/stdlib/v1.7/LinearAlgebra/src/qr.jl:566
  size(::Union{LinearAlgebra.Cholesky, LinearAlgebra.CholeskyPivoted}, ::Integer) at /opt/julia-1.7.3/share/julia/stdlib/v1.7/LinearAlgebra/src/cholesky.jl:495
  size(::Union{LinearOperators.AdjointLinearOperator, LinearOperators.TransposeLinearOperator}, ::Int64) at ~/.julia/packages/LinearOperators/58FwN/src/adjtrans.jl:63
  ...
Stacktrace:
 [1] _typed_hvncat_dims(#unused#::Type{Grad}, dims::Tuple{Int64, Int64}, row_first::Bool, as::Tuple{Grad, Grad, Grad})
   @ Base ./abstractarray.jl:2328
 [2] _typed_hvncat
   @ ./abstractarray.jl:2304 [inlined]
 [3] _hvncat
   @ ./abstractarray.jl:2133 [inlined]
 [4] hvncat
   @ ./abstractarray.jl:2129 [inlined]
 [5] RF_hard(B1::Float64, T::Float64, sys::Scanner; G::Vector{Int64})
   @ Koma.PulseDesigner ~/Documents/Koma.jl/src/sequences/PulseDesigner.jl:11
 [6] RF_hard(B1::Float64, T::Float64, sys::Scanner)
   @ Koma.PulseDesigner ~/Documents/Koma.jl/src/sequences/PulseDesigner.jl:10
 [7] top-level scope
   @ REPL[3]:1

[cncastillo]

Defining the size of a Grad and RF as 1 fixes the problem:

size(g::Grad, i::Int64) = 1 #In src/datatypes/sequence/Grad.jl
size(r::RF, i::Int64) = 1 #In src/datatypes/sequence/RF.jl

Examples:

julia> [RF(1,1);RF(1,1);;]
2×1 Matrix{RF}:
 RF(1.0e6 uT, 1000.0 ms, 0.0 Hz)
 RF(1.0e6 uT, 1000.0 ms, 0.0 Hz)

julia> [Grad(1,1);Grad(1,1);Grad(1,1);;]
3×1 Matrix{Grad}:
 Grad(1000.0 mT, 1000.0 ms)
 Grad(1000.0 mT, 1000.0 ms)
 Grad(1000.0 mT, 1000.0 ms)

Committing soon.

[cncastillo]

Fixed in aaf1c6e.