複数行の入力ができるテキストボックス

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reported by: https://siv3d.slack.com/archives/C03MZP8SH/p1652414866150069

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Siv3D Slack: #textArea 仮実装: https://gist.github.com/kerochan/d5034b86a485f328fecef69d57add75c

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レビュー 1 回目: https://gist.github.com/Reputeless/6d969e825be71c0205048fbfe60ed179

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サンプル

# include <Siv3D.hpp> // OpenSiv3D v0.6.9

void Main()
{
	Scene::SetBackground(ColorF{ 0.8, 0.9, 1.0 });

	const String text = TextReader{ U"example/LICENSE.txt" }.readAll();

	TextAreaEditState textAreaEditState{ text };

	bool enabled = true;

	while (System::Update())
	{
		if (SimpleGUI::Button(U"クリア", Vec2{ 40, 40 }, 100, TextInput::GetEditingText().isEmpty()))
		{
			textAreaEditState.clear();
		}

		SimpleGUI::CheckBox(enabled, U"enabled", Vec2{ 160, 40 });

		SimpleGUI::TextArea(textAreaEditState, Vec2{ 40, 90 }, SizeF{ 600, 300 }, SimpleGUI::PreferredTextAreaMaxChars, enabled);
	}
}