don't create new refdata unnecessarily in Unshare()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@44754 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/brush.cpp

@@ -129,7 +129,7 @@ void wxBrush::Unshare()
     {
         m_refData = new wxBrushRefData();
     }
-    else
+    else if (m_refData->GetRefCount() > 1)
     {
         wxBrushRefData* ref = new wxBrushRefData(*(wxBrushRefData*)m_refData);
         UnRef();

src/mac/carbon/font.cpp

@@ -456,7 +456,7 @@ void wxFont::Unshare()
     {
         m_refData = new wxFontRefData();
     }
-    else
+    else if (m_refData->GetRefCount() > 1)
     {
         wxFontRefData* ref = new wxFontRefData(*(wxFontRefData*)m_refData);
         UnRef();

src/mac/carbon/pen.cpp

@@ -93,7 +93,7 @@ void wxPen::Unshare()
     {
         m_refData = new wxPenRefData();
     }
-    else
+    else if (m_refData->GetRefCount() > 1)
     {
         wxPenRefData* ref = new wxPenRefData(*(wxPenRefData*)m_refData);
         UnRef();

src/msw/font.cpp

@@ -903,7 +903,7 @@ void wxFont::Unshare()
     {
         m_refData = new wxFontRefData();
     }
-    else
+    else if (m_refData->GetRefCount() > 1)
     {
         wxFontRefData* ref = new wxFontRefData(*M_FONTDATA);
         UnRef();

src/msw/pen.cpp

@@ -277,7 +277,7 @@ void wxPen::Unshare()
     {
         m_refData = new wxPenRefData();
     }
-    else
+    else if (m_refData->GetRefCount() > 1)
     {
         wxPenRefData* ref = new wxPenRefData(*(wxPenRefData*)m_refData);
         UnRef();