reftests: Mark the currently unfixed failures as XFAIL

They should be fixeed before 4.0 but the fixes are more involved. And we
want to start running the existing tests on CI, because they break
regularly and we want to catch that.

testsuite/reftests/meson.build

@@ -410,6 +410,21 @@ testdata = [
   'window-show-contents-on-map.ui',
 ]
 
+# These need to be fixed but the issue hasn't been tracked down.
+xfails = [
+  'background-color-transparent.ui',
+  'background-image-multiple.ui',
+  'background-origin.ui',
+  'border-half-pixel.ui',
+  'border-image-url.ui',
+  'label-shadows.ui',
+  'label-sizing.ui',
+  'label-wrap-justify.ui',
+  'sizegroups-evolution-identity-page.ui',
+  'textview-border-windows.ui',
+  'window-show-contents-on-map.ui',
+]
+
 foreach testname : testdata
   if testname.endswith('.ui') and not testname.endswith('.ref.ui')
     test('reftest ' + testname, gtk_reftest,
@@ -424,7 +439,8 @@ foreach testname : testdata
                 'GSK_RENDERER=opengl',
                 'REFTEST_MODULE_DIR=@0@'.format(meson.current_build_dir()),
               ],
-         suite: 'reftest')
+         suite: 'reftest',
+         should_fail: xfails.contains(testname))
   endif
 endforeach