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

[Keith David Bershatsky]

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
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