A callback that is invoked when a Material's Shader is changed in the Inspector.
This callback is invoked as the result of selecting a new Shader from the pop-up menu in the Inspector, or as the result of undoing or redoing actions that involved changing the Shader. It is called after a new Shader has been assigned to the Material currently in the Inspector, but before all Inspectors have been repainted (updated visually in the Editor).
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