Package: libpango-1.0-0 Version: 1.40.13-1 Severity: important Dear Maintainer,
Since Pango 1.40.13, Thai word break appears to be broken. This affects all GTK+-based text editors like gedit, mousepad, leafpad, etc. as well as Mozilla Firefox. Try, for example, opening this page with Firefox: https://linux.thai.net/~thep/text/aphaimanee.html The long continuous-text paragraph is supposed to be wrapped, but it's not. Downgrading Pango to 1.40.12 does solve the problem. Looking at upstream repository, this commit looks like the culprit: https://git.gnome.org/browse/pango/commit/?id=c4619480e536e393e2d4a8e26a6ceb5af1fe80e3 I've tried writing a simple program to test it, and it appears PangoLogAttr::is_char_break for all Thai characters except the first one of the line are cleared to zero, which causes break_thai() in pango/break-thai.c to skip setting is_line_break in all positions. -- System Information: Debian Release: buster/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 4.13.0-1-amd64 (SMP w/4 CPU cores) Locale: LANG=th_TH.utf8, LC_CTYPE=th_TH.utf8 (charmap=UTF-8), LANGUAGE=th_TH.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages libpango-1.0-0 depends on: ii fontconfig 2.12.3-0.2 ii libc6 2.24-17 ii libglib2.0-0 2.54.2-1 ii libthai0 0.1.27-1 libpango-1.0-0 recommends no packages. libpango-1.0-0 suggests no packages. -- no debconf information