Recover from OpenGL context loss

[DemiMarie]

OpenGL contexts can be lost for a variety of reasons, of which perhaps the most common is the GPU and its driver failing to limit the impact of faults to a single context. To prevent a buggy web page using WebGL from taking down the whole user session, it would be nice to use robust OpenGL contexts.

[kode54]

#2458

It needs plumbing into every plugin that uses OpenGL, and even then, I never got it to work without crashing the whole compositor.

[DemiMarie]

#2458

It needs plumbing into every plugin that uses OpenGL, and even then, I never got it to work without crashing the whole compositor.

See the last two comments — after a context loss, every pointer to an OpenGL resource should be cleared, at least for ones managed by wlroots.