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bug#17974: 24.3.92; scrolled wrapped tab starts with wrong position

From: YAMAMOTO Mitsuharu
Subject: bug#17974: 24.3.92; scrolled wrapped tab starts with wrong position
Date: Wed, 09 Jul 2014 08:44:41 +0900
User-agent: Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (Shij┼Ź) APEL/10.6 Emacs/22.3 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI)

I'm not sure if this should be counted as a bug.  This is not a
serious one, but causes a strange look in pixel-based smooth scrolling
a window with scaled text in the Mac port.  The recipe below can also
be reproduced in various X11 builds.  Probably this is related to

Steps to reproduce:

1. $ emacs -Q -D &
2. (setq frame-resize-pixelwise t) C-j
3. C-x 5 2
4. (progn
     (text-scale-set 5)
     (dotimes (i 10) (insert (make-string 7 (+ ?a i)) ?\t))
     (insert ?\n)) C-j
5. Resize the newly created frame so it looks like the first
   screenshot.  Notice that there is some space before "fffffff"
6. Type "(scroll-up 1)" and repeatedly hit "C-x C-e" until the line
   starting with "fffffff" comes at the top.


The line starting with "fffffff" is shown without leading space (the
second screenshot) whereas there was some space before the last scroll

                                     YAMAMOTO Mitsuharu

In GNU Emacs (x86_64-apple-darwin13.2.0, GTK+ Version 3.12.2)
 of 2014-07-09 on YAMAMOTO-no-iMac.local
Repository revision: 117365 address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.11406000
Configured using:
 `configure --without-imagemagick LDFLAGS=-L/opt/local/lib

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