Function nested_reflection_test

examples/include/imgui_app.cpp:471–534

static void nested_reflection_test() {
	ImGui::SeparatorText("Nested Struct / Class Reflection");
	ImGui::PushID("nested reflection");
	ImGui::Indent();

	static Bar bar;

	ImGui::Text("Nested Structs");
	HelpMarker("You need to define the ``IMGUI_REFLECT`` macro for each struct, this determines what is reflected");
	{
		const std::string code = R"(struct Foo {
	int a;
	float b;
	bool c;
};
IMGUI_REFLECT(Foo, a, b, c)

struct Bar {
	int x;
	float y;
	bool z;
	Foo foo;
};
IMGUI_REFLECT(Bar, x, y, z, foo)";

		IMGUI_SAMPLE_MULTI_CODE(code);

		ImGui::Text("Output:");
		ImReflect::Input("foo", bar);
	}

	ImGui::NewLine();

	ImGui::Text("Nested Structs - pushing");
	HelpMarker("Push setting inside another struct.");
	{
		auto config = ImSettings();
		config.push<Foo>()
			.push<int>()
			.min(0)
			.max(10)
			.as_slider()
			.pop()
			.pop();

		const std::string code = R"(auto config = ImSettings();
config.push<Bar>()
		.push<Foo>()
			.push<int>()
				.min(0)
				.max(10)
				.as_slider()
			.pop() // int
		.pop() // Foo
	.pop(); // Bar)";
		IMGUI_SAMPLE_MULTI_CODE(code);

		ImGui::Text("Output:");