fixed Freeze/Thaw() for wxCombobox (patch 925808)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28460 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/choice.cpp

@@ -232,6 +232,7 @@ int wxChoice::DoAppend(const wxString& item)
     {
         // we need to refresh our size in order to have enough space for the
         // newly added items
+        if ( !IsFrozen() )
             UpdateVisibleHeight();
     }
 
@@ -250,6 +251,7 @@ int wxChoice::DoInsert(const wxString& item, int pos)
     }
     else // ok
     {
+        if ( !IsFrozen() )
             UpdateVisibleHeight();
     }
 
@@ -267,6 +269,7 @@ void wxChoice::Delete(int n)
 
     SendMessage(GetHwnd(), CB_DELETESTRING, n, 0);
 
+    if ( !IsFrozen() )
         UpdateVisibleHeight();
 }
 
@@ -276,6 +279,7 @@ void wxChoice::Clear()
 
     SendMessage(GetHwnd(), CB_RESETCONTENT, 0, 0);
 
+    if ( !IsFrozen() )
         UpdateVisibleHeight();
 }