Bug#921537: gnome-terminal: mouse wheel scrolling sends 6 key up / key down escape sequences (kcuu1 / kcud1) in alternate screen

[Vincent Lefevre]

Package: gnome-terminal
Version: 3.30.2-2
Severity: normal

Some terminal applications use the alternate screen, which is the
equivalent of

  printf "\033[?47h"

When it is used, using the mouse wheel (up / down) sends 6 kcuu1 / kcud1
escape sequences (corresponding to the <up> and <down> keys). This is
potentially destructive, as what these <up> and <down> keys do depend
on the application.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-2-amd64 (SMP w/12 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=POSIX (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gnome-terminal depends on:
ii  dbus-user-session [default-dbus-session-bus]  1.12.12-1
ii  dbus-x11 [dbus-session-bus]                   1.12.12-1
ii  dconf-gsettings-backend [gsettings-backend]   0.30.1-2
ii  gnome-terminal-data                           3.30.2-2
ii  gsettings-desktop-schemas                     3.28.1-1
ii  libatk1.0-0                                   2.30.0-2
ii  libc6                                         2.28-6
ii  libdconf1                                     0.30.1-2
ii  libglib2.0-0                                  2.58.2-4
ii  libgtk-3-0                                    3.24.5-1
ii  libpango-1.0-0                                1.42.1-1
ii  libuuid1                                      2.33.1-0.1
ii  libvte-2.91-0                                 0.54.2-2
ii  libx11-6                                      2:1.6.7-1

Versions of packages gnome-terminal recommends:
ii  gvfs                               1.38.1-2+b1
ii  nautilus-extension-gnome-terminal  3.30.2-2
ii  yelp                               3.31.90-1

gnome-terminal suggests no packages.

-- no debconf information