sync: from linuxdeepin/dtkwidget

[deepin-ci-robot]

Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#608

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deepin pr auto review

关键摘要:

• 在DBounceAnimation::eventFilter函数中，对wheelEvent->pixelDelta().x()的判断逻辑可能不正确，因为pixelDelta表示的是两次鼠标移动的像素差，而wheelEvent->angleDelta().x()表示的是滚轮滚动的角度。应该使用wheelEvent->pixelDelta().y()来判断滚动方向。
• 在ImageLabel类的drawPixmap方法中，使用pixmap(Qt::ReturnByValue)可能会导致不必要的内存分配和上下文切换，建议使用pixmap的copy方法来避免这个问题。
• 在DSwitchButton类的paintEvent方法中，新增的代码块可能会导致按钮状态的多次更新，建议检查是否有必要更新状态。

是否建议立即修改:
是