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bug#10805: 24.0.93; edebug-trace t may cause stuff being inserted into c

From: Michael Heerdegen
Subject: bug#10805: 24.0.93; edebug-trace t may cause stuff being inserted into current buffer
Date: Fri, 17 Feb 2012 03:18:24 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.93 (gnu/linux)

martin rudalics <rudalics@gmx.at> writes:

> IIUC edebug conflates the concepts of displaying and popping to buffers.
> Take `edebug-bounce-point':
>   (save-excursion
>     ;; If the buffer's currently displayed, avoid set-window-configuration.
>     ---> Since `save-window-excursion' calls `set-window-configuration'
>          we don't "avoid" anything here.
>     (save-window-excursion
>       (edebug-pop-to-buffer edebug-outside-buffer)
>       ---> Here the `select-window' problem might strike as well.  But
>            why should the window be selected?  To make `goto-char',
>            `current-buffer' and `point' work?
>       (goto-char edebug-outside-point)
>       (message "Current buffer: %s Point: %s Mark: %s"
>              (current-buffer) (point)
>              (if (marker-buffer (edebug-mark-marker))
>                  (marker-position (edebug-mark-marker)) "<not set>"))
>       (edebug-sit-for arg)
>       ---> Popping back to the original window as the _last_ action of
>            a `save-window-excursion' doesn't make any sense.
>       (edebug-pop-to-buffer edebug-buffer (car edebug-window-data)))))
> This may select a window up to three times for the apparent single
> purpose to display the context of a position in some buffer.

I agree, I see no reason for doing this.

> > Please also note (another issue, but related) that if the trace buffer
> > is already visible in another (visible) frame, a new window pops up in
> > the current frame nevertheless, which is kind of annoying if source
> > files are spread over multiple frames.
> Probably because `edebug-get-buffer-window' (aliased to
> `get-buffer-window') is called with a nil ALL-FRAMES argument.  Try to
> use another argument (you probably have to raise frames to make this
> useful).

Yes, of course, that works.  The same applies to the source code
buffers.  Maybe we could introduce a user option specifying if windows
in other (visible) frames should be considered or not.  Dunno if that
would be appropriate, I didn't use edebug much before.  Currently,
edebug never considers other frames (most of the code seems to have been
written at a time when Emacs did not yet have frames).  Some users might
find it handy if they could use source buffers spread over several
frames, and edebug would work with them.


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