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GNU Emacs Lisp Reference Manual

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When Edebug needs to display something (e.g., in trace mode), it saves the current window configuration from "outside" Edebug (see section 28.17 Window Configurations). When you exit Edebug (by continuing the program), it restores the previous window configuration.

Emacs redisplays only when it pauses. Usually, when you continue execution, the program re-enters Edebug at a breakpoint or after stepping, without pausing or reading input in between. In such cases, Emacs never gets a chance to redisplay the "outside" configuration. Consequently, what you see is the same window configuration as the last time Edebug was active, with no interruption.

Entry to Edebug for displaying something also saves and restores the following data (though some of them are deliberately not restored if an error or quit signal occurs).

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  Copyright 2003   by The Free Software Foundation     Updated Jun 2003