sync: from linuxdeepin/dtkdeclarative

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Synchronize source files from linuxdeepin/dtkdeclarative.

Source-pull-request: linuxdeepin/dtkdeclarative#429

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关键摘要:

• blurSuc 变量在每次调用 setWindowBlurAreaByWM 后都被重新赋值，可能不是必要的，除非需要跟踪最后一次操作的结果。
• blurSuc 变量在最后被检查时，如果 blurSuc 为 false，则调用 setEnableBlurWindow(true)。这可能会导致窗口始终启用模糊效果，即使之前的设置失败。

是否建议立即修改:

• 是

建议的修改:

• 如果 blurSuc 变量仅用于跟踪最后一次操作的结果，应该移除多余的赋值操作。
• 如果 setEnableBlurWindow(true) 的调用是必要的，应该确保在所有可能的路径下都调用它，或者提供一种机制来禁用模糊效果。