tdf#120651 have to sort radiogroup by tab position

Change-Id: I8fcf4c4b186d8292c85babaa90e98396a5fbc71b
Reviewed-on: https://gerrit.libreoffice.org/61882
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

include/vcl/button.hxx

@@ -268,6 +268,8 @@ public:
 class VCL_DLLPUBLIC RadioButton : public Button
 {
 private:
+    friend class VclBuilder;
+
     std::shared_ptr< std::vector< VclPtr< RadioButton > > > m_xGroup;
     tools::Rectangle       maStateRect;
     tools::Rectangle       maMouseRect;

vcl/source/window/builder.cxx

@@ -479,7 +479,10 @@ VclBuilder::VclBuilder(vcl::Window *pParent, const OUString& sUIDir, const OUStr
             if (m_bLegacy)
                 pOne->group(*pOther);
             else
+            {
                 pOther->group(*pOne);
+                std::stable_sort(pOther->m_xGroup->begin(), pOther->m_xGroup->end(), sortIntoBestTabTraversalOrder(this));
+            }
         }
     }