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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Anders Lindgren <andlind <at> gmail.com>
Subject: bug#16856: closed (Re: [PATCH] Prevent cursor from over-drawing
 the fringe)
Date: Sat, 21 May 2016 19:08:02 +0000

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Your bug report

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

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 16856 <at> debbugs.gnu.org.

-- 
16856: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=16856
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Anders Lindgren <andlind <at> gmail.com>
To: Alan Third <alan <at> idiocy.org>
Cc: martin rudalics <rudalics <at> gmx.at>, 16856-done <at> debbugs.gnu.org
Subject: Re: [PATCH] Prevent cursor from over-drawing the fringe
Date: Sat, 21 May 2016 21:07:53 +0200

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Closed.

Fixed by Alan Third, see the following for details:

http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=e5015c5d9632a0bf685c093249ae4a7d3e825b13

    -- Anders

On Sat, May 21, 2016 at 9:35 AM, Alan Third <alan <at> idiocy.org> wrote:

> On Fri, May 20, 2016 at 09:33:52PM +0200, Anders Lindgren wrote:
> > Hi!
> >
> > I gave this patch a try.
> >
> > It works well, the ns port now behaves like the win32 and gtk+ parts of
> > Emacs.
> >
> > Do you want me to push it to master?
>
> If you could, thanks.
>
> > Ps. When the text area doesn't partially overlap a column, the cursor can
> > be drawn in the fringe. It's a bit unfortunate that when it do overlap,
> > only the part of the cursor in the text area is drawn. A worst case
> > scenario is that only a single pixel of the cursor is visible. An ideal
> > solution would be to draw the cursor partially in the text area and
> > partially in the fringe, but without leaving garbage behind when moved.
> > However, this is nothing that we can solve here and now as it would
> require
> > change to all emacs ports and possibly the core system.
>
> Yeah, I was thinking about this but couldn't really see much of a way
> around it. I checked the gtk+ and windows ports operated this way just
> to be sure I wasn't introducing another bug as it does seem wrong. :)
> --
> Alan Third
>

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From: Anders Lindgren <andlind <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Cursor leaves garbage in fringe (and a request: width of
 fringes + scroll bar should be full characters)
Date: Sun, 23 Feb 2014 22:39:55 +0100

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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 <at> 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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