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

From: Keith David Bershatsky
Subject: bug#22637: 25.1.50; `mode-line` face `:height` incompatible with `scroll-conservatively 101`.
Date: Fri, 12 Feb 2016 08:17:53 -0800

Thank you, Eli, for the explanation regarding how to better interpret the 
GLYPH_DEBUG messages that I was seeing on stderr.

I was able to reproduce problem 22637 on Emacs for Windows (XP) master branch 
with the following code starting from Emacs -Q, evaluating the following code 
in the scratch buffer, and then pressing the F1 key a couple of times.  The 
last line will remain below the bottom of the visible window each time the F1 
key is pressed.  On Windows, a height of 120 seems to work better for purposes 
of reproducing the problem, whereas on OSX I was using a height of 140.

(face-spec-set 'mode-line
  '((((class color) (min-colors 88))
     :box (:line-width -1 :style released-button)
     :background "grey75" :foreground "black" :height 120)
     :inverse-video t)))

(setq scroll-conservatively 101)

(global-eldoc-mode -1)

(global-font-lock-mode -1)

(blink-cursor-mode -1)

(defun my-insert-text ()
  (dotimes (i 200)
    (insert "I will not obey absurd orders.\n")))

(global-set-key [f1] 'my-insert-text)

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