For -dev xcairo, when you close the window by alt+F4 or other equivalents, the following fatal error message is the result:
XIO: fatal IO error 11 (Resource temporarily unavailable) on X server
This fatal error can be disruptive to certain environments (e.g., lisp) and should be replaced by a smooth exit from PLplot. as occurs under these same circumstances for -dev qtwidget and -dev wxwidgets.
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