sync: from linuxdeepin/dtkdeclarative

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Synchronize source files from linuxdeepin/dtkdeclarative.

Source-pull-request: linuxdeepin/dtkdeclarative#441

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关键摘要:

• 在新增的代码中，使用了条件编译来设置 image->setRetainWhileLoading(true)，这可能是为了兼容性考虑。需要确认这个改动是否符合项目的版本要求。

是否建议立即修改:

• 否，这个改动看起来是为了兼容性而添加的，没有明显的语法或逻辑错误。但是，需要确保这个改动不会对其他版本的用户造成影响，并且已经通过了充分的测试。如果项目要求支持多个Qt版本，这个改动是合理的。如果项目只支持一个Qt版本，可以考虑移除条件编译，直接设置这个属性。