Cannot edebug in tabbar.el.

Cannot edebug in tabbar.el.

[BobD]

Using emacs GNU Emacs 24.5.1 (i686-pc-mingw32) of 2015-04-11 on LEG570
tabbar.el:
  ;; Revision: $Id: tabbar.el,v 1.7 2009/03/02 21:02:34 davidswelt Exp $
  tabbar-version "2.0"

I ran edebug-defun in several tabbar functions, e.g. (tabbar-buffer-groups).
No breaks when function entered.
I added (message "Entered tabbar-buffer-groups") to (tabbar-buffer-groups).
The message appears dozens of times.

I tried this with "-*-no-byte-compile: t; -*-" present and absent.  No difference.

I was able to get a couple of functions to break into the debugger.

Any thoughts on how tabbar.el is selectively blocking edebug?

Re: Cannot edebug in tabbar.el.

[Stefan Monnier]

> Any thoughts on how tabbar.el is selectively blocking edebug?

Edebug can't be used when evaluating code during redisplay (because
that would require redisplaying during the redisplay).  So most likely
the code you can't edebug is run during redisplay (at its beginning,
when (re)computing the header-line that should be displayed).


        Stefan