GNU bug report logs - #22637
25.1.50; `mode-line` face `:height` incompatible with `scroll-conservatively 101`.

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From: Keith David Bershatsky <esq <at> lawlist.com>
To: 22637 <at> debbugs.gnu.org
Subject: bug#22637: 25.1.50; `mode-line` face `:height` incompatible with `scroll-conservatively 101`.
Date: Thu, 11 Feb 2016 18:12:57 -0800

Setting the `:height` property of the `mode-line` face to 140, and `scroll-conservatively 101`, prevent redisplay from making point fully visible following a large yank of text.  [This also happens with some of my custom movement functions similar to paragraph down.]

Anything attached to the `timer-idle-list` will cause the cursor to come back into view when the clocks strikes midnight.  The following three minor modes are disabled in this example so that the `timer-idle-list` is empty.  NOTE:  Even something attached to the idle timer such as `(run-with-idle-timer 10 'repeat 'ignore)` will trigger a redisplay after 10 seconds and cause point to come back into view.

    (face-spec-set 'mode-line
      '((((class color) (min-colors 88))
         :box (:line-width -1 :style released-button)
         :background "grey75" :foreground "black" :height 140)
        (t
         :inverse-video t)))

    (setq scroll-conservatively 101)

    (global-eldoc-mode -1)

    (global-font-lock-mode -1)

    (blink-cursor-mode -1)

As a suggestion / feature, please consider adding a GLYPH_DEBUG message to indicate when a function from the `timer-idle-list` has triggered a redisplay.  It sure would have been a lot easier to come up with a minimal working example of the above-mentioned issue if I could have seen what was happening with `trace-redisplay`.

#ifdef GLYPH_DEBUG
      debug_method_add (w, "redisplay triggered by function attached to `timer-idle-list'");
#endif

Thanks,

Keith

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In GNU Emacs 25.1.50.1 (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 10.6.8 (Build 10K549))
 of 2016-02-08 built on server.private
Repository revision: de76a167dc09dc695a5acebabb7ab354a6bf556e
Windowing system distributor 'Apple', version 10.3.1038
Configured using:
 'configure --with-ns --without-imagemagick --enable-checking=glyphs
 CPPFLAGS=-I/Users/HOME/.0.data/.0.emacs/macports/include
 LDFLAGS=-L/Users/HOME/.0.data/.0.emacs/macports/lib'

Configured features:
JPEG RSVG DBUS NOTIFY ACL LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS

Important settings:
  locale-coding-system: utf-8-unix

Major mode: FM

Minor modes in effect:
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  ml-mode: t
  ds-mode: t
  sd-mode: t

Recent messages:
*beep*

Load-path shadows:
None found.

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Memory information:
((conses 16 2441605 221891)
 (symbols 48 86439 1)
 (miscs 40 148 312)
 (strings 32 189178 34146)
 (string-bytes 1 7207331)
 (vectors 16 56373)
 (vector-slots 8 1154092 15038)
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 (intervals 56 342 49)
 (buffers 976 13))

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