Fix/cgdisplaystream fallback - #176
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July 28, 2026 10:13
问题或需求描述：Mac mini 外接单屏环境下 Wi‑Fi 握手成功但扩展失败 修复或实现思路：仅在 Code=3 时回退 CGDisplayStream，并复用现有编码背压管线 复现路径：Extend → virtual display never appeared in SCShareableContent
问题或需求描述：虚拟显示创建成功但保持 offline，系统设置仅显示物理屏。 修复或实现思路：更新虚拟显示 productID，避开 WindowServer 对旧显示身份的持久状态。 复现路径：通过 WiFi 扩展到 iPad 后打开“系统设置 → 显示器”。
问题或需求描述：macOS Tahoe 重启后会把既有虚拟显示身份恢复成未激活状态，导致 WiFi 扩展仍显示已连接但接收端持续暗屏。 修复或实现思路：持久化虚拟显示序列代际，严格等待 online、active 与 NSScreen 就绪；捕获期间检测空白帧或离线状态并自动重建，同时保留旧实例残留的重试窗口。 复现路径：Mac 重启后通过 WiFi 连接 iPad，OpenDisplay 显示正在扩展但系统显示器列表缺少虚拟屏，iPad 暗屏。
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fixed wifi extend fail