Bug#1035469: libwebkit2gtk-4.0-37: After upgrading to libwebkit2gtk-4.0-37_2.40.1-1~deb11u1, Gnome Evolution does not load the body content of emails.

[Alberto Garcia]

So what happens is that the Evolution in bullseye is using a
deprecated WebKit API that was removed in the 2.40.x branch (the
function remains but it's a no-op now). Reverting that change in
WebKit is unfortunately not an option.

This was fixed in Evolution upstream a while ago[1] so bookworm is not
affected. The patch was backported to at least Evolution 3.28.5[2] and
3.40.4[3]. The latter can be applied fine to our version (3.38.3) and
fixes the problem for me, I'm putting Milan Crha on Cc for comments
since the patch is not trivial.

I'm also attaching the debdiff for Evolution with this patch included.

The other alternative would be to switch back to WebKitGTK 2.38.x but
that branch is not likely to receive any further security updates.

Berto

[1] https://gitlab.gnome.org/GNOME/evolution/-/issues/2001
[2] https://gitlab.com/redhat/centos-stream/rpms/evolution/-/blob/c8s/evolution-3.28.5-frame-flattenning.patch
[3] https://gitlab.com/redhat/centos-stream/rpms/evolution/-/blob/c9s/evolution-3.40.4-frame-flattenning.patch
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