Fix glslscale bug when binding a framebuffer before gl_swap_buffers. #425
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Using the Intel HD Graphics 2500 driver for Windows 10 and possibly some other old graphics drivers (the SDL documentation cites macOS), swapping to a framebuffer other than 0 prior to calling SDL_GL_SwapWindow can cause the screen to flicker or not display at all. This was occurring in the GLSL renderer, though for some reason only with
glslscale(and notglsl).