GNU bug report logs - #15957
24.3.50; Follow mode scrolling broken on Emacs trunk

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Message #14 received at 15957 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Anders Lindgren <andlind <at> gmail.com>
Cc: 15957 <at> debbugs.gnu.org
Subject: Re: bug#15957: 24.3.50; Follow mode scrolling broken on Emacs trunk
Date: Sun, 24 Nov 2013 11:10:32 +0100

> I really doubt that the code in `follow-scroll-up' is broken.

I didn't say so.

> Follow-mode
> is designed so that the rearrangement of the other windows (the ones that
> follow the selected window) occur in the post-command hook (to allow
> Follow-mode to act upon all Emacs commands, not only it's special
> function). It appears that something has changed in the display engine, or
> in the way that post-command-hook is called, that makes this mechanism
> fail. This could also account for the difference we see when the function
> is called via a key sequence as compared to via M-x.

IIUC we'd have to find out when and where follow-mode expects the
selected window to be a certain window and why this sometimes fails.  So
maybe you should try the change I suggested.

> This is also the reason why reported this as a bug, rather than digging
> into the code myself. However, I could try to add log code to Follow mode,
> to check if I could try to figure out what is going on.

Please do that.

Thanks, martin

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