变更内容Qt Quick Timeline

Qt 6 的变更，是出于让框架更高效、更易于使用的刻意努力。

我们力求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 成为更好的框架，某些变更在所难免。

使用Qt Quick Timeline 时，移植到 Qt 6 无需进行任何代码修改。

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