sync: from linuxdeepin/dtkwidget

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Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#606

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关键摘要:

• 在DBounceAnimation::eventFilter函数中，对QWheelEvent的pixelDelta进行了重新计算，这可能是为了支持不同平台上的鼠标滚轮事件。需要确认这一改动是否适用于所有目标平台。
• 在ImageLabel类的drawPixmap方法中，使用了pixmap(Qt::ReturnByValue)来获取QPixmap对象，这可能是为了提高性能或避免不必要的对象创建。需要验证这一改动是否符合设计要求。

是否建议立即修改:

• 是，需要确保这些更改不会影响应用程序在所有目标平台上的功能和性能。同时，应该验证这些更改是否符合设计规范和用户体验要求。