Edebug Recursive Edit

When Edebug is entered and actually reads commands from the user, it saves (and later restores) these additional data:

• The current match data. See section The Match Data.
• last-command, this-command, last-command-char, last-input-char, last-input-event, last-command-event, last-event-frame, last-nonmenu-event, and track-mouse. Commands used within Edebug do not affect these variables outside of Edebug. The key sequence returned by this-command-keys is changed by executing commands within Edebug and there is no way to reset the key sequence from Lisp. Edebug cannot save and restore the value of unread-command-events. Entering Edebug while this variable has a nontrivial value can interfere with execution of the program you are debugging.
• Complex commands executed while in Edebug are added to the variable command-history. In rare cases this can alter execution.
• Within Edebug, the recursion depth appears one deeper than the recursion depth outside Edebug. This is not true of the automatically updated evaluation list window.
• standard-output and standard-input are bound to nil by the recursive-edit, but Edebug temporarily restores them during evaluations.
• The state of keyboard macro definition is saved and restored. While Edebug is active, defining-kbd-macro is bound to edebug-continue-kbd-macro.

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