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mygo v0.6.4 在 Linux 初始化时会默认设置 WEBKIT_DISABLE_DMABUF_RENDERER=1， 导致 Wayland + Mesa（Intel/AMD）环境下每帧回退到 CPU 拷贝、画布与 UI 严重掉帧。 在 runGUI 启动前检测安全的 Wayland + Mesa 环境并预设 WEBKIT_DISABLE_DMABUF_RENDERER=0， 同时对 NVIDIA、虚拟机、容器、软件渲染及用户显式配置的环境变量保持原有行为。 Fixes graphif#795 AI 工具：Google Antigravity AI 模型：Claude Opus 5.5、Gemini 4 Argon
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Fixes #795
在 Wayland + Intel/AMD 核显（尤其是 2x 缩放高分屏）下，因为
mygov0.6.4默认把WEBKIT_DISABLE_DMABUF_RENDERER设成了1，WebKitGTK 渲染每帧都要走 CPU 拷贝，画布平移缩放只有 24fps 左右，UI 也很卡。参考了上游 egoist/mygo#1124 里新增的
DMABUFRendererAuto检测逻辑，在runGUI()启动前加了个判断：如果是 Linux + Wayland 会话、有 DRM 渲染节点，且不是 NVIDIA / 虚拟机 / 容器 / 软件渲染，你在环境变量里也没手动指定过WEBKIT_DISABLE_DMABUF_RENDERER，就自动设成0启用 DMA-BUF 渲染；其他情况保持原来的行为不变，避免白屏。顺便在
main_test.go里补了对应的单测。AI 工具：Google Antigravity
AI 模型：Claude Opus 5.5、Gemini 4 Argon