Package: libncursesw5 Version: 6.0+20160213-1 Severity: important Since ncurses 6.0+20160213-1, mutt's thread display is broken. Downgrading libncursesw5 to 6.0+20151024-2 fixes the issue.
-- System Information: Debian Release: stretch/sid APT prefers unstable APT policy: (500, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Kernel: Linux 4.4.3 (SMP w/4 CPU cores) Locale: LANG=ja_JP.eucJP, LC_CTYPE=ja_JP.eucJP (charmap=EUC-JP) Shell: /bin/sh linked to /bin/dash Init: sysvinit (via /sbin/init) Versions of packages libncursesw5 depends on: ii libc6 2.21-9 ii libtinfo5 6.0+20160213-1 Versions of packages libncursesw5 recommends: pn libgpm2 <none> libncursesw5 suggests no packages. -- no debconf information

