Fix repeat for arrays of arrays

Ref #22747
(cherry picked from commit e8e475e)

Author: p-zubieta

base/abstractarraymath.jl

@@ -415,7 +415,7 @@ _reperr(s, n, N) = throw(ArgumentError("number of " * s * " repetitions " *
                 n = inner[i]
                 inner_indices[i] = (1:n) + ((c[i] - 1) * n)
             end
-            R[inner_indices...] = A[c]
+            fill!(view(R, inner_indices...), A[c])
         end
     end
 

test/arrayops.jl

@@ -793,6 +793,11 @@ end
     R = repeat(1:2, inner=(3,), outer=(2,))
     @test R == [1, 1, 1, 2, 2, 2, 1, 1, 1, 2, 2, 2]
 
+    # Arrays of arrays
+    @test repeat([[1], [2]], inner=2) == [[1], [1], [2], [2]]
+    @test repeat([[1], [2]], outer=2) == [[1], [2], [1], [2]]
+    @test repeat([[1], [2]], inner=2, outer=2) == [[1], [1], [2], [2], [1], [1], [2], [2]]
+
     @test size(repeat([1], inner=(0,))) == (0,)
     @test size(repeat([1], outer=(0,))) == (0,)
     @test size(repeat([1 1], inner=(0, 1))) == (0, 2)