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bug#2690: 23.0.91; line spacing with X servers

From: Peter Dyballa
Subject: bug#2690: 23.0.91; line spacing with X servers
Date: Mon, 16 Mar 2009 21:04:36 +0100


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 (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



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