The window whose context is current, or null if no window's context is current.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED.
This function may be called from any thread.
@sa @ref context_current @sa @ref glfwMakeContextCurrent
Added in version 3.0.
Ingroup: context
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Returns the window whose context is current on the calling thread.
This function returns the window whose OpenGL or OpenGL ES context is current on the calling thread.