Package: libc6 Version: 2.36-7 Severity: serious The new libc6 appears to have some change related to Unicode that yields display issues in screen 4.9.0-3, such as horizontal and/or vertical text shifting. A consequence of this text shifting is that in Mutt (in particular with arrow_cursor), one may select a message to be deleted, but a different message is actually deleted.
There is no such issue under bullseye (Debian 11.6), which also has GNU Screen 4.09.00, so the breakage appears to be due to libc6. If the change has been done on purpose, then there are missing dependency relationships that should prevent the installation of incompatible software until such software has been updated to support this change. Example to reproduce the issue with the U+1FAF6 HEART HANDS character under Debian/unstable: 1. Run "screen" in a 80-column terminal. 2. Open this mailbox with "mutt -F /dev/null -f heart-hands.mbox". Result: line 10 is shifted 1 column to the right, and character "v" appears on the following line. 3. Create a new Screen window and switch back to the original window. Result: messages 1 to 9 are shifted upward. -- System Information: Debian Release: bookworm/sid APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'stable-security'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental') merged-usr: no Architecture: amd64 (x86_64) Kernel: Linux 6.0.0-6-amd64 (SMP w/8 CPU threads; PREEMPT) Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE Locale: LANG=POSIX, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages libc6 depends on: ii libgcc-s1 12.2.0-12 Versions of packages libc6 recommends: ii libidn2-0 2.3.3-1+b1 Versions of packages libc6 suggests: ii debconf [debconf-2.0] 1.5.81 ii glibc-doc 2.36-7 ii libc-l10n 2.36-7 pn libnss-nis <none> pn libnss-nisplus <none> ii locales 2.36-7 -- debconf information: glibc/disable-screensaver: * glibc/restart-services: postfix ssh cups cron atd glibc/kernel-too-old: * libraries/restart-without-asking: false glibc/restart-failed: glibc/kernel-not-supported: glibc/upgrade: true -- Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
heart-hands.mbox
Description: application/mbox
