bug#2690: 23.0.91; line spacing with X servers

[Peter Dyballa <Peter_Dyballa@Freenet.DE>]

Hello!

In Mac OS X 10.4.11 (Tiger) I have as default from Apple an X11R6.6  
based XFree86 4.4.0 X server. With this one everything is OK in terms  
of line spacing. From the MacPorts project (installed in /opt tree) I  
can compile, install, and run X.org Release 7.3 for Tiger (XQuartz  
2.3.3 (xorg-server 1.4.2-apple35)). It does not offer much I am  
missing (transparency), but it is the same X server that is  
distributed with Mac OS X 10.5 (Leopard). This X server shows in GNU  
Emacsen 23.0.x a reduced line spacing, independent from the X toolkit  
Xaw3d or GTK. The descenders of g, p, q, ... penetrate the next line  
(particularly visible by flashing effects of the horizontal "bar" of  
g's descender for example when a shell command or a compile process  
produce output outside, below, my stable viewport, or when scroll-up  
or scroll-finishes and the view stabilises, and from time to time  
when only the cursor is blinking – anti-aliasing?).

GNU Emacsen 22.x do not show this effect. Today I made two tests: I  
first compiled GNU Emacs 22.3 with the X11R7.3 software – no effect  
on line spacing, in neither X servers, everything's OK. And I  
compiled GNU Emacs 23.0.91, updated today, with Apple's X11R6.6 and  
some "auxiliary" software (GTK, libs TIFF, JPEG, GIF, PNG, RSVG, XPM)  
from X11R6.6 based Fink project (installed in /sw tree). It shows the  
too tight line spacing effect in X11R7.3. All use libfontconfig 1 or  
2 and libfreetype. Libotf is not used. The X11R6.6 version does not  
use libXft, for which I can't check the cause because the  
configure.log file is just a few 100 bytes long.

I did not check with lsof that the Emacs binaries are really using  
those shared libraries they are linked to (I rely on the output of  
otool, Apple's ldd command), but I can check upon request. Do you  
have an explanation for the X server's behaviour? And also a cure?

There is another effect in *shell* buffer: just pressing RET on an  
empty line positions the cursor in the next line in column 0, at the  
beginning of the prompt (%n ! /\  in tcsh) which is customised and  
not manipulated by ANSI.


In GNU Emacs 23.0.91.1 (powerpc-apple-darwin8.11.0, GTK+ Version 2.14.7)
  of 2009-03-16 on localhost
Windowing system distributor `The X.Org Foundation', version  
11.0.10402000
configured using `configure  '--without-sound' '--without-pop' '-- 
with-dbus' '--with-libotf' '--x-includes=/usr/X11R6/include' '--x- 
libraries=/usr/X11R6/lib' '--enable-locallisppath=/Library/ 
Application Support/Emacs/calendar23:/Library/Application Support/ 
Emacs' 'PKG_CONFIG_PATH=/usr/X11R6/lib/pkgconfig:/usr/local/lib/ 
pkgconfig:/usr/lib/pkgconfig' 'CFLAGS=-Wno-pointer-sign -H -pipe - 
fPIC -mcpu=7450 -mtune=7450 -fast -mpim-altivec -ftree-vectorize - 
foptimize-register-move -freorder-blocks -freorder-blocks-and- 
partition -fthread-jumps -fpeephole -fno-crossjumping' 'LDFLAGS=- 
dead_strip -multiply_defined suppress -L/usr/X11R6/lib' 'CPPFLAGS=-no- 
cpp-precomp -I/usr/include/openssl -I/sw/include/pango-1.0 -I/sw/lib/ 
fontconfig2/include -I/usr/local/include -I/sw/include''

Important settings:
   value of $LC_ALL: nil
   value of $LC_COLLATE: nil
   value of $LC_CTYPE: de_DE.UTF-8
   value of $LC_MESSAGES: nil
   value of $LC_MONETARY: nil
   value of $LC_NUMERIC: nil
   value of $LC_TIME: nil
   value of $LANG: de_DE.UTF-8
   value of $XMODIFIERS: nil
   locale-coding-system: utf-8-unix
   default-enable-multibyte-characters: t

--
Greetings

   Pete

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