对Qt Quick Timeline
Qt 6 的改动是有意识地使框架更高效、更易用的结果。
我们努力在每个版本中保持所有公共 API 的二进制和源代码兼容性。但为了使 Qt 成为一个更好的框架，有些改动是不可避免的。
当使用Qt Quick Timeline 移植到 Qt 6 时，无需更改代码。
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