> > Kim Storm created a variable overlay-arrow-variable-list to allow
> > multiple overlay arrows (see info). I have used this for buffers
> > displaying assembler in gdb-ui.el (gdb-overlay-arrow-position).
>
> I tried to use overlay-arrow-variable-list, but can't display more
> than one fringe arrow in one buffer. I tried the code below:
I don't use more than one arrow per buffer. However, I do think compile
should use overlay-arrow-variable-list instead of making
overlay-arrow-position a local variable. I now can reproduce the conflict that
Juan-Leon reports. GUD and Compile are operating on the same source buffer and
the local variable masks the global one when set in gud-display-line. The
global value is used to set window-point and this remains unchanged (from
nil):
(defun gud-display-line (true-file line)
...
> ***buffer = source buffer***
(with-current-buffer buffer
(unless (or (verify-visited-file-modtime buffer) gud-keep-buffer)
(if (yes-or-no-p
(format "File %s changed on disk. Reread from disk? "
(buffer-name)))
(revert-buffer t t)
(setq gud-keep-buffer t)))
(save-restriction
(widen)
(goto-line line)
(setq pos (point))
(setq overlay-arrow-string "=>")
(or overlay-arrow-position
(setq overlay-arrow-position (make-marker)))
(set-marker overlay-arrow-position (point) (current-buffer)))
(cond ((or (< pos (point-min)) (> pos (point-max)))
(widen)
(goto-char pos))))
> ***current buffer = GUD buffer***
(if window (set-window-point window overlay-arrow-position))))))
The reason that Kim hasn't seen the same problem when using Gnus and GUD
at the same time is probably because they don't share the same buffers.
Nick
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