Wayland XDG 输出协议，版本不稳定 v1，版本 3

Xdg 输出协议是扩展的 Wayland 输出区域描述方式

用于 Qt Wayland 组合器 API 和 Qt Wayland 平台插件。

源代码可在 qtwayland/src/3rdparty/protocol/xdg-output-unstable-v1.xml 中找到。

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