Bug#1108277: libwebkit2gtk-4.1-0: rendering to offscreen window segfaults (regression v. 2.46 -> 2.48)

[test]

Package: libwebkit2gtk-4.1-0
Version: 2.48.3-1
Severity: normal

Dear Maintainer,

the update of the package from v. 2.46 to 2.48 includes a regression which
leads to a segfault when rendering a WebKitWebView in an Gtk3 offscreen window
created by calling gtk_offscreen_window_new().  This breaks, inter alia,
printing HTML messages from the MUA Balsa
<https://gitlab.gnome.org/GNOME/balsa>.

See <https://bugs.webkit.org/show_bug.cgi?id=291372> for a detailed discussion.
Please note that the bug affects both Bookworm and Trixie.

The bug has been fixed with commit
<https://github.com/WebKit/WebKit/pull/46494/commits>.  I could apply it (with
line offsets) to 2.48.3 and re-build the package on Trixie, which fixes the
segfault.




-- System Information:
Debian Release: 13.0
  APT prefers testing-security
  APT policy: (500, 'testing-security'), (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.32-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libwebkit2gtk-4.1-0 depends on:
ii  bubblewrap                      0.11.0-2
ii  gstreamer1.0-plugins-base       1.26.2-1
ii  gstreamer1.0-plugins-good       1.26.1-1
ii  libatk1.0-0t64                  2.56.2-1
ii  libatomic1                      14.2.0-19
ii  libavif16                       1.2.1-1.2
ii  libc6                           2.41-9
ii  libcairo-gobject2               1.18.4-1+b1
ii  libcairo2                       1.18.4-1+b1
ii  libdrm2                         2.4.124-2
ii  libenchant-2-2                  2.8.2+dfsg1-3
ii  libepoxy0                       1.5.10-2
ii  libexpat1                       2.7.1-1
ii  libflite1                       2.2-7
ii  libfontconfig1                  2.15.0-2.3
ii  libfreetype6                    2.13.3+dfsg-1
ii  libgbm1                         25.0.5-2
ii  libgcc-s1                       14.2.0-19
ii  libgcrypt20                     1.11.0-7
ii  libgdk-pixbuf-2.0-0             2.42.12+dfsg-3
ii  libgles2                        1.7.0-1+b2
ii  libglib2.0-0t64                 2.84.3-1
ii  libgpg-error0                   1.51-4
ii  libgstreamer-gl1.0-0            1.26.2-1
ii  libgstreamer-plugins-bad1.0-0   1.26.1-1
ii  libgstreamer-plugins-base1.0-0  1.26.2-1
ii  libgstreamer1.0-0               1.26.2-1
ii  libgtk-3-0t64                   3.24.49-3
ii  libharfbuzz-icu0                10.2.0-1+b1
ii  libharfbuzz0b                   10.2.0-1+b1
ii  libhyphen0                      2.8.8-7+b2
ii  libicu76                        76.1-4
ii  libjavascriptcoregtk-4.1-0      2.48.3-1
ii  libjpeg62-turbo                 1:2.1.5-4
ii  libjxl0.11                      0.11.1-4
ii  liblcms2-2                      2.16-2
ii  libmanette-0.2-0                0.2.12-1
ii  libpango-1.0-0                  1.56.3-1
ii  libpangocairo-1.0-0             1.56.3-1
ii  libpng16-16t64                  1.6.48-1
ii  libseccomp2                     2.6.0-2
ii  libsecret-1-0                   0.21.7-1
ii  libsoup-3.0-0                   3.6.5-1
ii  libsqlite3-0                    3.46.1-6
ii  libstdc++6                      14.2.0-19
ii  libsystemd0                     257.6-1
ii  libtasn1-6                      4.20.0-2
ii  libwayland-client0              1.23.1-3
ii  libwayland-egl1                 1.23.1-3
ii  libwayland-server0              1.23.1-3
ii  libwebp7                        1.5.0-0.1
ii  libwebpdemux2                   1.5.0-0.1
ii  libwebpmux3                     1.5.0-0.1
ii  libwoff1                        1.0.2-2+b2
ii  libx11-6                        2:1.8.12-1
ii  libxml2                         2.12.7+dfsg+really2.9.14-1
ii  libxslt1.1                      1.1.35-1.2
ii  xdg-dbus-proxy                  0.1.6-1
ii  zlib1g                          1:1.3.dfsg+really1.3.1-1+b1

Versions of packages libwebkit2gtk-4.1-0 recommends:
ii  gstreamer1.0-gl           1.26.2-1
ii  gstreamer1.0-libav        1.26.2-1
ii  gstreamer1.0-plugins-bad  1.26.1-1
ii  libgl1-mesa-dri           25.0.5-2
ii  xdg-desktop-portal-gtk    1.15.3-1

Versions of packages libwebkit2gtk-4.1-0 suggests:
ii  gstreamer1.0-alsa  1.26.2-1

-- no debconf information