fix: fix renamespace for array variables

Author: AayushSabharwal

src/systems/abstractsystem.jl

@@ -758,7 +758,7 @@ struct ParentScope <: SymScope
 end
 function ParentScope(sym::Union{Num, Symbolic, Symbolics.Arr{Num}})
     apply_to_variables(sym) do sym
-        if istree(sym) && operation(sym) == getindex
+        if istree(sym) && operation(sym) === getindex
             args = arguments(sym)
             a1 = setmetadata(args[1], SymScope,
                 ParentScope(getmetadata(value(args[1]), SymScope, LocalScope())))
@@ -814,6 +814,11 @@ function renamespace(sys, x)
             return similarterm(x, operation(x),
                 Any[renamespace(sys, only(arguments(x)))])::T
         end
+        if istree(x) && operation(x) === getindex
+            args = arguments(x)
+            return similarterm(
+                x, operation(x), vcat(renamespace(sys, args[1]), args[2:end]))::T
+        end
         let scope = getmetadata(x, SymScope, LocalScope())
             if scope isa LocalScope
                 rename(x, renamespace(getname(sys), getname(x)))::T