fdo#82859 RTF import: fillColor is unsigned

Otherwise ARGB 0xFFFFFFFF would turn into black.

Change-Id: I690f34d888ca9a013e8ce1af2c7ef8ed88ee28b0

sw/qa/extras/rtfimport/data/fdo82859.rtf

+{\rtf1
+{\shp
+{\*\shpinst\shpbypara\shpbyignore\shptop4154\shpbottom11234\shpbxcolumn\shpbxignore\shpleft-90\shpright9270
+{\sp
+{\sn fillColor}
+{\sv 4294967295}
+}
+{\sp
+{\sn shapeType}
+{\sv 202}
+}
+{\sp
+{\sn posrelv}
+{\sv 2}
+}
+{\sp
+{\sn posrelh}
+{\sv 2}
+}
+{\shptxt
+}
+}
+}
+\par
+}

sw/qa/extras/rtfimport/rtfimport.cxx

@@ -1990,6 +1990,12 @@ DECLARE_RTFIMPORT_TEST(testFdo85179, "fdo85179.rtf")
     CPPUNIT_ASSERT_EQUAL(sal_uInt32(50800/360), getProperty<table::BorderLine2>(getShape(1), "TopBorder").LineWidth);
 }
 
+DECLARE_RTFIMPORT_TEST(testFdo82859, "fdo82859.rtf")
+{
+    // This was 0: "0xffffff" was converted to 0, i.e. the background was black instead of the default.
+    CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(-1), getProperty<sal_Int32>(getShape(1), "BackColor"));
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

writerfilter/source/rtftok/rtfsdrimport.cxx

@@ -357,7 +357,7 @@ void RTFSdrImport::resolve(RTFShape& rShape, bool bClose, ShapeOrPict const shap
         }
         else if (i->first == "fillColor" && xPropertySet.is())
         {
-            aAny <<= msfilter::util::BGRToRGB(i->second.toInt32());
+            aAny <<= msfilter::util::BGRToRGB(i->second.toUInt32());
             if (m_bTextFrame)
                 xPropertySet->setPropertyValue("BackColor", aAny);
             else