Wayland 主选择协议，版本 1

主选择扩展允许通过选择文本并使用鼠标中键粘贴来复制文本。

在 Qt Wayland 平台插件中使用

源代码位于 qtwayland/src/3rdparty/protocol/wp-primary-selection-unstable-v1.xml。

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