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bug#23347: 25.0.92; Follow mode scrolling broken -- scrolls only one pag

From: Anders Lindgren
Subject: bug#23347: 25.0.92; Follow mode scrolling broken -- scrolls only one page
Date: Sat, 23 Apr 2016 19:25:06 +0200


In Emacs 25.0.92, the command `follow-scroll-up' and `follow-scroll-down' only scroll one page. The intention is that they should scroll as many pages as there are windows in the window group (i.e. the number of windows showing the same buffer in the current frame, when follow-mode is enabled), as was done in Emacs 24.

Steps to repeat:

    emacs -Q
    C-h t
    M-x follow-delete-other-windows-and-split RET
      ;; Page 1 and 2 are visible.
    C-c . C-v
      ;; Now, page 2 and 3 are visible.

I expect page 3 and 4 to be visible.

The idea behind `follow-scroll-up' and `follow-scroll-down' is to scroll away the entire window group at once. For example, if you have six side by side windows, `follow-scroll-up' should go from displaying page 1 .. 6 to 7 .. 12. Currently Emacs 25 go from 1 .. 6 to 2 .. 7.

    -- Anders

Ps. I'm the original author of Follow mode, but I haven't been involved in recent development.

In GNU Emacs (x86_64-apple-darwin14.5.0, NS appkit-1348.17 Version 10.10.5 (Build 14F1713))
 of 2016-04-10 built on macpro.lan
Repository revision: 0e7bcec103073eceecc2621c19e4d290b2d97e8d
Windowing system distributor 'Apple', version 10.3.1348
Configured using:
 'configure --with-ns --without-dbus'

Configured features:

Important settings:
  value of $LC_CTYPE: UTF-8
  value of $LANG: en_SE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  follow-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Preparing tutorial ...
Resume your last saved tutorial? (y or n) n
You can run the command ‘follow-scroll-up’ with C-c . C-v

Load-path shadows:
None found.

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mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util help-fns mail-prsvr mail-utils follow
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Memory information:
((conses 16 196924 8312)
 (symbols 48 19718 0)
 (miscs 40 48 196)
 (strings 32 15395 5251)
 (string-bytes 1 449890)
 (vectors 16 33084)
 (vector-slots 8 650906 6707)
 (floats 8 158 31)
 (intervals 56 196 0)
 (buffers 976 12))

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