b9db87f8accaee889860f34f696a62ede33df21b
This is because GTK3 can't share contexts between GtkGLAreas. We may be able to avoid the copy using the GL_OES_EGL_image or GL_OES_EGL_image_external extensions. Note that keyboard input doesn't work on the secondary view, this requires moving the keyboard handling from FlView to FlEngine. Proposing this now as a step forwards, but not yet useful for real applications.
When rendering into secondary views, copy the pixel contents between contexts (flutter/engine#55639)
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