void XtUnregisterDrawable(display, drawable)
Display* display;
Drawable drawable;
If the drawable is already registered with another widget, or if the drawable is the window of a widget in the client's widget tree, the results of calling XtRegisterDrawable are undefined.
XtUnregisterDrawable removes an association created with XtRegisterDrawable. If the drawable is the window of a widget in the client's widget tree the results of calling XtUnregisterDrawable are undefined.
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