reftest_compare_surfaces: Report how much the images differ

In unattended/non-interactive/autobuilder environments where the images
are not trivially accessible, this provides a way to distinguish between
totally different rendering and more subtle issues.

Signed-off-by: Simon McVittie <smcv@debian.org>
Forwarded: https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/3195
Applied-upstream: no, upstream want reftests to be a strict pass/fail with identical results required

Gbp-Pq: Name reftest_compare_surfaces-Report-how-much-the-images-diffe.patch

Don't list images from unknown directories in icon cache

After GTK 2.12.0, gtk-update-icon-cache fails if there is a PNG file
placed directly in /usr/share/icons/hicolor (not in a correct
subdirectory like 48x48/apps).

TODO: This is believed to have been fixed differently upstream, so maybe
this change is no longer necessary:
"I believe a slightly different fix that I did some time ago fixes this
too." --Matthias Clasen, 2008-02-16 04:43:10 UTC

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=451634
Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=444285
Forwarded: yes
Applied-upstream: no

Gbp-Pq: Name 060_ignore-random-icons.patch

Do not allow devices in an offscreen hierarchy to take grabs.

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=658563
Bug: https://gitlab.gnome.org/GNOME/gtk/issues/368
Bug-Ubuntu: https://launchpad.net/bugs/804009
Forwarded: yes

Gbp-Pq: Name 017_no_offscreen_device_grabbing.patch

Don't let offscreen widget do grabbing

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=607668
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=658563
Bug: https://gitlab.gnome.org/GNOME/gtk/issues/368
Bug-Ubuntu: https://bugs.launchpad.net/bugs/512427
Forwarded: yes

Gbp-Pq: Name 016_no_offscreen_widgets_grabbing.patch

gtk+3.0 (3.24.38-4) unstable; urgency=medium

  * Have -dev package depend on libcloudproviders-dev on Debian

[dgit import unpatched gtk+3.0 3.24.38-4]

Import gtk+3.0_3.24.38-4.debian.tar.xz

[dgit import tarball gtk+3.0 3.24.38-4 gtk+3.0_3.24.38-4.debian.tar.xz]

Import gtk+3.0_3.24.38.orig.tar.xz

[dgit import orig gtk+3.0_3.24.38.orig.tar.xz]