-Werror=sign-compare

Change-Id: I6be5df685575c6909d4adfcee0ccc4fb0bd4b600

cui/source/options/optcolor.cxx

@@ -1033,7 +1033,7 @@ unsigned ColorConfigWindow_Impl::GetPosBehindLastChapter () const
 long ColorConfigWindow_Impl::GetDeltaAbove (Group eGroup) const
 {
     long nDelta = 0;
-    for (unsigned i = 0; i != eGroup; ++i)
+    for (int i = 0; i != eGroup; ++i)
         if (!IsGroupVisible(static_cast<Group>(i)))
             nDelta += vChapters[i]->GetHeight();
     return nDelta;