Why timers are now catching errors

[Thierry Volpiatto]

Hi,
is there a particular reason to catch errors in timers functions ?

--8<---------------cut here---------------start------------->8---
(condition-case-unless-debug err
    ;; Timer functions should not change the current buffer.
    ;; If they do, all kinds of nasty surprises can happen,
    ;; and it can be hellish to track down their source.
    (save-current-buffer
      (apply (timer--function timer) (timer--args timer)))
  (error (message "Error in timer: %S" err)))
--8<---------------cut here---------------end--------------->8---

Timer functions may return errors or diverses different values 
at one time and next time no errors etc...
This change will break many commands using timers.

This happen in `timer-event-handler', hope this will not be merged in
24.3...

-- 
  Thierry
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