[Evolution] Bug#839217: evolution: White flash on mail area of email reader

[Russel Winder]

Package: evolution
Version: 3.22.0-2
Severity: important

Dear Maintainer,

I have reported this as https://bugzilla.gnome.org/show_bug.cgi?id=772233 but am replicating the report here.

Debian Sid has just moved 3.20 → 3.22 and now whenever moving from email to email, there is a white flash
before the email is rendered in the email reading area. I am using GNOME dark mode. All the areas of
Evolution are rendering correctly per se, but this white flash on every change of email is very, very
disturbing and disruptive.

I am assuming that the email reading area is defaulting to white instead of the default background colour of
the GNOME theme currently in place.

I have set the severity to major as this is a bit of a UX nightmare even though nothing is broken about the
behaviour of Evolution.


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

Kernel: Linux 4.7.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages evolution depends on:
ii  dbus                   1.10.10-1
ii  evolution-common       3.22.0-2
ii  evolution-data-server  3.22.0-2
ii  libc6                  2.24-3
ii  libcamel-1.2-59        3.22.0-2
ii  libclutter-gtk-1.0-0   1.8.2-1
ii  libecal-1.2-19         3.22.0-2
ii  libedataserver-1.2-22  3.22.0-2
ii  libevolution           3.22.0-2
ii  libglib2.0-0           2.50.0-1
ii  libgtk-3-0             3.22.0-1
ii  libical2               2.0.0-0.5+b1
ii  libicu57               57.1-4
ii  libnotify4             0.7.6-2
ii  libsoup2.4-1           2.56.0-1
ii  libwebkit2gtk-4.0-37   2.14.0-1
ii  libxml2                2.9.4+dfsg1-2
ii  psmisc                 22.21-2.1+b1

Versions of packages evolution recommends:
ii  evolution-plugins  3.22.0-2
ii  spamassassin       3.4.1-5
ii  yelp               3.22.0-1

Versions of packages evolution suggests:
pn  evolution-ews                   <none>
pn  evolution-plugins-experimental  <none>
ii  gnupg                           2.1.15-3
pn  network-manager                 <none>

-- debconf information:
  evolution/needs_shutdown:
  evolution/kill_processes: