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bug#17969: 24.3.92; C-p does not move the cursor for some scale text


From: YAMAMOTO Mitsuharu
Subject: bug#17969: 24.3.92; C-p does not move the cursor for some scale text
Date: Tue, 08 Jul 2014 11:17:25 +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)

Steps to reproduce:

1. $ emacs -Q -D &
2. Type the following expression and hit C-j in the *scrath* buffer.

  (progn
    (text-scale-set 6)
    (insert (make-string 9 ?\t) "aaaa\n"))

   In my environment, the screen looks like the attached screenshot.

3. Hit C-p twice.

Result:

The first C-p moves the cursor upward, but for the second one (the
cursor stays at the same position).

Unfortunately, some adjustment seems to be necessary for the
reproducing recipe depending on the environment.  The above one is for
the GTK+ build with the xft font backend on OS X 10.9.  For the Mac
port, I had to use the following one, for example:

  (progn
    (text-scale-set 5)
    (insert (make-string 10 ?\t) "aaaaaa\n"))

                                     YAMAMOTO Mitsuharu
                                address@hidden

In GNU Emacs 24.3.92.1 (x86_64-apple-darwin13.2.0, GTK+ Version 3.12.2)
 of 2014-07-07 on YAMAMOTO-no-iMac.local
Repository revision: 117359 address@hidden
Windowing system distributor `The X.Org Foundation', version 11.0.11406000
Configured using:
 `configure --without-imagemagick LDFLAGS=-L/opt/local/lib
 CPPFLAGS=-I/opt/local/include'

PNG image


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