Bug#908434: gnome-terminal: Text cursor disappears when focus lost in Wayland

[Claudio Sacerdoti Coen]

Package: gnome-terminal
Version: 3.30.0-1
Severity: grave
Justification: renders package unusable

Dear Maintainer,

when gnome-terminal is started in a Wayland session, when the terminal
looses focus the blinking cursor disappears and it remains invisible
forever. The only way to make it re-appear is to switch to another tab
and back.

The bug applies to lxterminal as well. Starting lxterminal with
GDK_BACKEND=x11 or starting gnome in X11 makes the bug disappear.

Notes:
1. I noticed the bug last Friday when gnome-terminal was 3.28.2-1. I
waited for the 3.30.xx version, but the bug is still here
2. The bug was not there before upgrading gnome-shell, mutter and
related libs to 3.29/3.30. Therefore I suspect that the bug is due to
one of them.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.18.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en (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]  1.12.10-1
ii  dbus-x11 [dbus-session-bus]                   1.12.10-1
ii  dconf-gsettings-backend [gsettings-backend]   0.30.0-1
ii  gnome-terminal-data                           3.30.0-1
ii  gsettings-desktop-schemas                     3.28.0-1
ii  libatk1.0-0                                   2.30.0-1
ii  libc6                                         2.27-6
ii  libdconf1                                     0.30.0-1
ii  libglib2.0-0                                  2.58.0-3
ii  libgtk-3-0                                    3.24.0-1
ii  libpango-1.0-0                                1.42.4-3
ii  libuuid1                                      2.32.1-0.1
ii  libvte-2.91-0                                 0.54.0-1
ii  libx11-6                                      2:1.6.6-1
Versions of packages gnome-terminal recommends:
ii  gvfs                               1.36.2-1
ii  nautilus-extension-gnome-terminal  3.30.0-1
ii  yelp                               3.30.0-1

gnome-terminal suggests no packages.

-- no debconf information

-- 
Prof. Claudio Sacerdoti Coen
Department of Computer Science and Engineering
University of Bologna