bug#17497: 24.4.50; TTY menu glitches

[Eli Zaretskii]

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
      (beginning-of-buffer)
      (dotimes (i 40)
       (put-text-property
        (line-beginning-position)
        (line-end-position)
        'point-entered
        'my-help)
       (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.