The window to query.
The monitor, or null if the window is in windowed mode or an error occurred.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED.
This function must only be called from the main thread.
@sa @ref window_monitor @sa @ref glfwSetWindowMonitor
Added in version 3.0.
Ingroup: window
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Returns the monitor that the window uses for full screen mode.
This function returns the handle of the monitor that the specified window is in full screen on.