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Lam Wei Lun
0f10b9d0da
The default path set WEBKIT_DISABLE_COMPOSITING_MODE whenever DISPLAY and WAYLAND_DISPLAY were both set, but a native Wayland app inherits both, so a build with EGL disabled accelerated compositing — and with it threaded scrolling — while running on Wayland, where the XWayland bug does not apply. The only default-path case that really runs through XWayland is the forced GDK_BACKEND=x11 used when wx lacks EGL, so set the variable there. The backend cannot be re-checked later: that branch exports GDK_BACKEND itself, so the force and a user's GDK_BACKEND=x11 opt-in, which deliberately keeps compositing, would be indistinguishable. Behaviour is unchanged for WebKitGTK >= 2.42, where the gate already skipped the variable, and for builds without EGL. A build with EGL on WebKitGTK < 2.42 in a Wayland session no longer loses compositing and threaded scrolling. The wxWidgets skill reference is updated to match.