[gnome-software/wip/mcrha/css-absolute-url] Misc: Use absolute URL in CSS

[Milan Crha <mcrha src gnome org>]

commit 4ce749cecf9ef544d2047758b093ed0c0efad89e
Author: Milan Crha <mcrha redhat com>
Date:   Mon Nov 1 09:59:08 2021 +0100

    Misc: Use absolute URL in CSS
    
    The gtk4 stopped interpreting relative URL-s, thus use an absolute URL,
    including the scheme, in the CSS.
    
    Related to https://gitlab.gnome.org/GNOME/gtk/-/issues/4373

 plugins/dummy/gs-plugin-dummy.c                                   | 2 +-
 plugins/eos-updater/gs-plugin-eos-updater.c                       | 2 +-
 .../fedora-pkgdb-collections/gs-plugin-fedora-pkgdb-collections.c | 8 +++++---
 3 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/plugins/dummy/gs-plugin-dummy.c b/plugins/dummy/gs-plugin-dummy.c
index 059f1c4ae..d6febfeff 100644
--- a/plugins/dummy/gs-plugin-dummy.c
+++ b/plugins/dummy/gs-plugin-dummy.c
@@ -819,7 +819,7 @@ gs_plugin_add_distro_upgrades (GsPlugin *plugin,
        gs_app_set_license (app, GS_APP_QUALITY_LOWEST, "LicenseRef-free");
        gs_app_set_management_plugin (app, gs_plugin_get_name (plugin));
        gs_app_set_metadata (app, "GnomeSoftware::UpgradeBanner-css",
-                            "background: url('" DATADIR "/gnome-software/upgrade-bg.png');"
+                            "background: url('file://" DATADIR "/gnome-software/upgrade-bg.png');"
                             "background-size: 100% 100%;"
                             "border-width: 0;");
        gs_app_add_icon (app, ic);
diff --git a/plugins/eos-updater/gs-plugin-eos-updater.c b/plugins/eos-updater/gs-plugin-eos-updater.c
index 4679058c9..454898c5b 100644
--- a/plugins/eos-updater/gs-plugin-eos-updater.c
+++ b/plugins/eos-updater/gs-plugin-eos-updater.c
@@ -571,7 +571,7 @@ gs_plugin_setup (GsPlugin *plugin,
        gs_app_add_quirk (app, GS_APP_QUIRK_NOT_REVIEWABLE);
        gs_app_set_management_plugin (app, gs_plugin_get_name (plugin));
        gs_app_set_metadata (app, "GnomeSoftware::UpgradeBanner-css",
-                            "background: url('" DATADIR "/gnome-software/upgrade-bg.png');"
+                            "background: url('file://" DATADIR "/gnome-software/upgrade-bg.png');"
                             "background-size: 100% 100%;");
 
        self->os_upgrade = g_steal_pointer (&app);
diff --git a/plugins/fedora-pkgdb-collections/gs-plugin-fedora-pkgdb-collections.c 
b/plugins/fedora-pkgdb-collections/gs-plugin-fedora-pkgdb-collections.c
index 5865a1995..2da96f1db 100644
--- a/plugins/fedora-pkgdb-collections/gs-plugin-fedora-pkgdb-collections.c
+++ b/plugins/fedora-pkgdb-collections/gs-plugin-fedora-pkgdb-collections.c
@@ -262,19 +262,21 @@ _get_upgrade_css_background (guint version)
 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
                        filename1 = g_strdup_printf (uri, version, version, version);
 #pragma GCC diagnostic pop
+                       if (*filename1 == '/')
+                               return g_strdup_printf ("url('file://%s')", filename1);
                        return g_strdup_printf ("url('%s')", filename1);
                }
        }
 
        filename1 = g_strdup_printf ("/usr/share/backgrounds/f%u/default/standard/f%u.png", version, version);
        if (g_file_test (filename1, G_FILE_TEST_EXISTS))
-               return g_strdup_printf ("url('%s')", filename1);
+               return g_strdup_printf ("url('file://%s')", filename1);
 
        filename2 = g_strdup_printf ("/usr/share/gnome-software/backgrounds/f%u.png", version);
        if (g_file_test (filename2, G_FILE_TEST_EXISTS))
-               return g_strdup_printf ("url('%s')", filename2);
+               return g_strdup_printf ("url('file://%s')", filename2);
 
-       return g_strdup ("url('" DATADIR "/gnome-software/upgrade-bg.png')");
+       return g_strdup ("url('file://" DATADIR "/gnome-software/upgrade-bg.png')");
 }
 
 static gint