As part of followup for JDK-8262750 i went through all the places in OpenGL pipeline where we use glFlush() to gracefully override OGLContext/just flush the GPU queue. We have these graceful overrides/flush in SET_SCRATCH_SURFACE, MASKFILL, DRAWPOLY, DRAWGLYPHLIST, SET_SURFACES and in OGLRenderQueue.

We need to replicate same thing in Metal to maintain appropriate state. I am not seeing any active bug related to this, it is just adding tighter checks in logic.