ScFiltersTest::testOrcusODSStyleInterface fails with liborcus 0.13.3

Hello,

I initially filed
https://bugs.documentfoundation.org/show_bug.cgi?id=115931 but it was
suggested to me to raise the issue on the mailing list instead.

So here it goes: when building libreoffice 6.0 with an external
liborcus (version 0.13.3), unit tests fail:

subsequent_filters-test.cxx:2398:Assertion
Test name: ScFiltersTest::testOrcusODSStyleInterface
equality assertion failed
- Expected: Color: R:254 G:255 B: 204
- Actual : Color: R:255 G:255 B: 255

This is most likely caused by that upstream change:
https://gitlab.com/orcus/orcus/commit/f821995022df8dd1e580dd22cf131584b2b1ac4f

I'm not familiar with that code, but I came up with a tentative patch
(which I will actually put to the test soon):

--- a/sc/source/filter/orcus/interface.cxx
+++ b/sc/source/filter/orcus/interface.cxx
@@ -839,7 +839,7 @@ void ScOrcusStyles::fill::applyToItemSet
         return;
     }

-    rSet.Put(SvxBrushItem(maBgColor, ATTR_BACKGROUND));
+    rSet.Put(SvxBrushItem(maFgColor, ATTR_BACKGROUND));
 }

Thoughts and feedback welcome!

Regards,

 Olivier