[PATCH] Fix background_color in hippo css

["Marco Pesenti Gritti" <mpgritti gmail com>]

With this fix we have back prelighting and visual selection in the
browsers (which was on Owen list).

It was working for the canvas element only because it's going through
a different code path there.

Marco

Index: common/hippo/hippo-canvas-style.c
===================================================================
--- common/hippo/hippo-canvas-style.c   (revision 7250)
+++ common/hippo/hippo-canvas-style.c   (working copy)
@@ -728,7 +728,9 @@
             CRDeclaration *decl = style->properties[i];
             const char *property_name = decl->property->stryng->str;

-            if (!g_str_has_prefix(property_name, "background"))
+            if (g_str_has_prefix(property_name, "background"))
+                property_name += 10;
+            else
                 continue;

             if (strcmp(property_name, "") == 0) {