bug#16856: 24.3.50; Cursor leaves garbage in fringe (and a request: width of fringes + scroll bar should be full characters)

[Anders Lindgren <andlind@gmail.com>]

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Hi!

The cursor leaves garbage in the fringe column.

Steps to repeat:

    Emacs -Q
    (setq truncate-partial-width-windows nil) C-j
    C-x 3
    C-x 3
    C-x o
    C-u 15 x
    C-p

Here, the cursor have left a one-pixel bar in the fringe area.

In other scenarios I have seen the cursor leave two or three pixels wide
garbage. (I use six columns and a 6x8 font.)

I use OS X 10.9.

I have noticed that when splitting two windows horizontally, the width of
the fringes + scroll bar between the two windows don't add up to full
characters. Instead, they are five characters and one pixel. My theory is
that this extra pixel pushes the cursor into the fringe to the right.

If possible, I would like to see the pixel width of fringes + scroll bar to
be a multiple of the width of the font used in the frame, since it is much
more convenient for elisp packages that make layout decisions. (As I
mentioned above, now they are 5 characters and one pixel. In 24.3 they were
exactly six characters wide.)

Sincerely,
    Anders Lindgren

In GNU Emacs 24.3.50.2 (x86_64-apple-darwin13.0.0, NS apple-appkit-1265.00)
 of 2014-02-16 on macpro.lan
Repository revision: 116451
jan.h.d@swipnet.se-20140216095141-cop794qd0bf30tmt
Windowing system distributor `Apple', version 10.3.1265
Configured using:
 `configure --with-ns'

Important settings:
  value of $LC_CTYPE: UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-y C-j C-x 3 C-x 3 C-x o C-u 1 5 x C-p <up> <down>
C-g C-x 1 <escape> x r e p o r t <tab> <return>

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