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bug#17497: 24.4.50; TTY menu glitches

From: Eli Zaretskii
Subject: bug#17497: 24.4.50; TTY menu glitches
Date: Wed, 04 Jun 2014 13:16:21 +0300

Here's a simple recipe to generate screen updates very similar to the
ones caused by a menu update.  Do they cause similar artifacts on the
offending terminal emulators?

 emacs -Q -nw

 Insert and evaluate this function:
 (defun my-help (old new)
  (message "We are at %s" (point)))

 C-x 3

 C-x C-f src/xdisp.c RET (any sufficiently large file will do)

 M-x hl-line-mode RET

 M-: (progn
      (dotimes (i 40)
       (forward-line))) RET

Now move cursor down and up through the first 40 lines of the buffer:
you should see the background of the current line change as you move,
and also help-echo-like messages in the echo area for each non-empty
line in the buffer that follows an empty line.

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