Strange (void)io; in example_glfw_opengl3

[AntMaster7]

I noticed the somewhat strange statement (void)io; in line 67 here. Casting something to void might have its reasons. But in the given case, the value is not assigned anywhere. Does this statement have a reason or is just some leftover?

[ocornut]

This is in order to avoid a “unused variable” warning while conveniently allowing to uncomment the config lines below. We should use a IM_UNUSED() macro to make this more obvious.