如果当前项目是作为临时项目创建的，则返回 true。
临时项目是使用"-temporary"命令行参数创建的项目。它位于文件系统中的临时位置（例如用户的 TEMP 或 TMPDIR 文件夹）；在关闭项目时，系统将提示用户为项目选择一个永久位置，便于项目移动到其中。
另请参阅：EditorApplication.SetTemporaryProjectKeepPath。
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