[Cuis-dev] How to stop exception triggering code in its tracks?

[Alexandre Rousseau]

I accidentally introduced a bug in my class instance initialization code
(adding a submorph to itself). When instantiating my class, the debugger
appeared but seemed impossible to interact with while the task bar rapidly
filled up with more such debugger representations.

Unable to deal with this, I killed my cuis environment, losing 30 minutes
of work.

What do you do when faced with runaway exceptions? Is there some keyboard
action once can perform to stop the execution of it?
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