| Examples: OpenGL: skip rendering and calling glViewport() if we have a zero-fixed buffer (#486) | 
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| examples/opengl3_example/imgui_impl_glfw_gl3.cpp | 
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| examples/opengl_example/imgui_impl_glfw.cpp | 
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| examples/sdl_opengl3_example/imgui_impl_sdl_gl3.cpp | 
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| examples/sdl_opengl_example/imgui_impl_sdl.cpp | 
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