Various window-manager events, such as focus selection and closing of

Various window-manager events, such as focus selection and closing of
X windows, are passed back from KEYBOARD-READ as special events to be
executed by the caller.  Previously, these were handled by the X
terminal abstraction.  This allows the caller to recognize that the
user is doing something unusual, and to behave accordingly.  For
example, incremental search treats such events exactly like other
complicated editor commands: the search is terminated before the
command is executed.