avoid calling glfwTerminate() inside callback #603
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[GLFW guidelines](https://www.glfw.org/docs/3.3/intro_guide.html#reentrancy) say `glfwTerminate()` should not be called inside an event callback, since it is not reentrant. This fixes segfault when closing the `MjViewer` window by pressing ESC.
samarth-robo
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GLFW guidelines say
glfwTerminate()should not be called inside an event callback, since it is not reentrant. This fixes segfault when closing theMjViewerwindow by pressing ESC.