sync: from linuxdeepin/dtkwidget

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Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#628

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关键摘要:

• q->close(); 直接调用 close() 方法，可能需要确认这是否符合设计要求，因为 windowHandle()->close(); 可能会触发特定的关闭逻辑。
• 移除了对 windowHandle() 的检查，这可能会影响关闭窗口时的行为，需要确认这一改动是否符合预期。

是否建议立即修改:

• 是，需要确认关闭窗口的逻辑是否正确，并确保移除 windowHandle() 检查后的行为符合设计要求。