Bug#945240: evolution: HTML messages become unreadable after changing theme

[Eerste Laatste]

I am experiencing exactly the same problem and found an acknowledged upstream bug + fix and other details like cause and backport info here:

https://gitlab.gnome.org/GNOME/evolution/issues/617

On Thu, 21 Nov 2019 16:17:27 +0000 Ben Hutchings <
ben.hutchings at codethink.co.uk> wrote:
> Package: evolution
> Version: 3.30.5-1.1
> Severity: important
> 
> I recently changed GNOME's theme from Adwaita to Adwaita-dark.  This
> changed Evolution's default text colour for HTML display from black
to
> white, but the background colour remains white.  (The default colours
> in the composer appear to be unchanged.)
> 
> If a received HTML message sets background and text colours, it
> displays properly, but if it does not (which seems to be the default
> behaviour of Thunderbird) then it is unreadable in Evolution.  (A
> temporary workaround is to select all text.)
> 
> The same problem affects HighContrast and HighContrastInverse
> themes, so this is an accessibility issue.
> 
> Ben.
> 
> -- System Information:
> Debian Release: 10.1
>   APT prefers stable
>   APT policy: (990, 'stable'), (500, 'stable-updates'), (500,
'unstable')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386, armhf, arm64
> 
> Kernel: Linux 4.19.0-6-amd64 (SMP w/2 CPU cores)
> Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: systemd (via /run/systemd/system)
> LSM: AppArmor: enabled
> 
> Versions of packages evolution depends on:
> ii  dbus                   1.12.16-1
> ii  evolution-common       3.30.5-1.1
> ii  evolution-data-server  3.30.5-1
> ii  libc6                  2.28-10
> ii  libcamel-1.2-62        3.30.5-1
> ii  libclutter-gtk-1.0-0   1.8.4-4
> ii  libecal-1.2-19         3.30.5-1
> ii  libedataserver-1.2-23  3.30.5-1
> ii  libevolution           3.30.5-1.1
> ii  libglib2.0-0           2.58.3-2+deb10u1
> ii  libgtk-3-0             3.24.5-1
> ii  libical3               3.0.4-3
> ii  libnotify4             0.7.7-4
> ii  libsoup2.4-1           2.64.2-2
> ii  libwebkit2gtk-4.0-37   2.26.2-1~deb10+1
> ii  libxml2                2.9.4+dfsg1-7+b3
> ii  psmisc                 23.2-1
> 
> Versions of packages evolution recommends:
> ii  evolution-plugin-bogofilter  3.30.5-1.1
> ii  evolution-plugin-pstimport   3.30.5-1.1
> ii  evolution-plugins            3.30.5-1.1
> ii  yelp                         3.31.90-1
> 
> Versions of packages evolution suggests:
> ii  evolution-ews                   3.30.5-1
> pn  evolution-plugins-experimental  <none>