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Thus when entering edebug, the focus will be moved to the frame with the
source being debugged, and when its finished, the focus will move back.
Commands edebug-visit-eval-list (`E') and edebug-bounce-point (`p') have been
likewise amended.

* src/keyboard.c (readable_events): Handle FOCUS_OUT_EVENT as an invisible
event.  This prevents input-pending-p returning t when one of these events
arrives, and thus obviates an instant termination of sit-for when there's no
"real" event waiting.

* lisp/emacs-lisp/edebug.el (edebug-focus-frame): New function.
(edebug-default-enter, edebug--display-1, edbug-where, edebug-bounce-point)
(edebug-visit-eval-list): Call edebug-focus-frame to move focus into the
window newly selected by edebug-pop-to-buffer.