bug#20074: edebug tracing can't be stopped with 'S'

[Alexis <flexibeast@gmail.com>]

On 2015-03-13T22:07:14+1100, Eli Zaretskii <eliz@gnu.org> said:

 >> From: Alexis <flexibeast@gmail.com>

 >> Date: Fri, 13 Mar 2015 21:19:57 +1100
 >> 
 >> i'd be interested to know whether this behaviour is considered 
 >> a bug.

 EZ> Yes, it's a bug (or maybe a long-missing feature: I'm not 
 sure it EZ> has ever worked as intended).

Okay, thanks, that's useful to know. :-) (More on which below.)

 EZ> Where do you see a tight loop during Edebug tracing?

Sorry, i meant the code loop in the original bug report:

    (defun forever () 
      (interactive) (while t (message "doing nothing")))

i have occasionally accidentally written ELisp i feel is 
analogous: to wit, code that doesn't need to wait for relatively 
'slow' events, such as disk IO or user input. On those occasions, 
Emacs itself has become unresponsive to any of my attempts at 
input, and i've had to terminate the Emacs process 
itself. However, i assumed this was an instance of "So don't write 
such code then!", rather than thinking "Emacs should really still 
be responsive to user input in this situation."


Alexis.