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Re: force-mode-line-update ALL argument
From: |
MON KEY |
Subject: |
Re: force-mode-line-update ALL argument |
Date: |
Sun, 23 May 2010 00:29:48 -0400 |
On Sat, May 22, 2010 at 4:50 AM, martin rudalics <address@hidden> wrote:
> Thank you for your efforts but I don't get it yet :-(
Me either. Who does?
> What makes you conclude that a `set-buffer' on the value returned by
> `other-buffer' causes updating the modeline
I trust (my assummption) that it does.
I have no way to _visually_ confirm this. Its Kantian Emacsology :P
> of a buffer that maybe has neither been changed nor displayed?
The return value of `other-buffer' is not affected by whether it has been
changed but it does affect it.
> What is a non-visible buffer on a frame?
Precisely that.
> When a buffer is visible it is on a frame.
> When a buffer is not visible it is on no frame.
>From :FILE src/buffer.c
/* Switch to buffer B temporarily for redisplay purposes.
This avoids certain things that don't need to be done within redisplay. */
/* Move the assoc for buffer BUF to the front of buffer-alist. Since
we do this each time BUF is selected visibly, the more recently
selected buffers are always closer to the front of the list. This
means that other_buffer is more likely to choose a relevant buffer. */
/* Set the current buffer to B.
We previously set windows_or_buffers_changed here to invalidate
global unchanged information in beg_unchanged and end_unchanged.
This is no longer necessary because we now compute unchanged
information on a buffer-basis. Every action affecting other
windows than the selected one requires a select_window at some
time, and that increments windows_or_buffers_changed. */
> This predicate is set by a buffer change and by nothing else.
If you can't see it how can you be so sure? :P
> The only reason of updating a modeline is when the buffer is visible.
Apparently the redisplay backend doesn't share this perspective.
>
> martin, still hoping that someone can shed light on this issue
>
Good luck! :)
/s_P\