IDLGenerators: Allow methods with multiple sequence arguments

Previously, a method with multiple sequence arguments would cause a
compile error, as the same variable name was redeclared when iterating
the sequence for each argument. This change disambiguates these
variable names.

Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp

@@ -1030,12 +1030,12 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
     if (!@js_name@@[email protected]_object())
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotAnObject, @js_name@@[email protected]_string_without_side_effects());
 
-    auto iterator_method@recursion_depth@ = TRY(@js_name@@[email protected]_method(vm, vm.well_known_symbol_iterator()));
-    if (!iterator_method@recursion_depth@)
+    auto @js_name@@js_suffix@_iterator_method@recursion_depth@ = TRY(@js_name@@[email protected]_method(vm, vm.well_known_symbol_iterator()));
+    if (!@js_name@@js_suffix@_iterator_method@recursion_depth@)
         return vm.throw_completion<JS::TypeError>(JS::ErrorType::NotIterable, @js_name@@[email protected]_string_without_side_effects());
 )~~~");
 
-        parameterized_type.generate_sequence_from_iterable(sequence_generator, ByteString::formatted("{}{}", acceptable_cpp_name, optional ? "_non_optional" : ""), ByteString::formatted("{}{}", js_name, js_suffix), ByteString::formatted("iterator_method{}", recursion_depth), interface, recursion_depth + 1);
+        parameterized_type.generate_sequence_from_iterable(sequence_generator, ByteString::formatted("{}{}", acceptable_cpp_name, optional ? "_non_optional" : ""), ByteString::formatted("{}{}", js_name, js_suffix), ByteString::formatted("{}{}_iterator_method{}", js_name, js_suffix, recursion_depth), interface, recursion_depth + 1);
 
         if (optional) {
             sequence_generator.append(R"~~~(
@@ -1699,7 +1699,7 @@ void IDL::ParameterizedType::generate_sequence_from_iterable(SourceGenerator& ge
 
     // FIXME: The WebIDL spec is out of date - it should be using GetIteratorFromMethod.
     sequence_generator.append(R"~~~(
-    auto iterator@recursion_depth@ = TRY(JS::get_iterator_from_method(vm, @iterable_cpp_name@, *@iterator_method_cpp_name@));
+    auto @iterable_cpp_name@_iterator@recursion_depth@ = TRY(JS::get_iterator_from_method(vm, @iterable_cpp_name@, *@iterator_method_cpp_name@));
 )~~~");
 
     if (sequence_cpp_type.sequence_storage_type == SequenceStorageType::Vector) {
@@ -1714,7 +1714,7 @@ void IDL::ParameterizedType::generate_sequence_from_iterable(SourceGenerator& ge
 
     sequence_generator.append(R"~~~(
     for (;;) {
-        auto next@recursion_depth@ = TRY(JS::iterator_step(vm, iterator@recursion_depth@));
+        auto next@recursion_depth@ = TRY(JS::iterator_step(vm, @iterable_cpp_name@_iterator@recursion_depth@));
         if (!next@recursion_depth@)
             break;