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A global break condition stops execution when a
specified condition is satisfied, no matter where that may occur.
Edebug evaluates the global break condition at every stop point;
if it evaluates to a non-nil value, then execution
stops or pauses depending on the execution mode, as if a
breakpoint had been hit. If evaluating the condition gets an
error, execution does not stop.
The condition expression is stored in
edebug-global-break-condition. You can specify a new
expression using the X command from the source code
buffer while Edebug is active, or using C-x X X from
any buffer at any time, as long as Edebug is loaded
(edebug-set-global-break-condition).
The global break condition is the simplest way to find where
in your code some event occurs, but it makes code run much more
slowly. So you should reset the condition to nil
when not using it.