allocate size for the extra controls in the file dialog (#9679)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58270 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/private.h

@@ -605,14 +605,25 @@ private:
 class GlobalPtr
 {
 public:
+    // default ctor, call Init() later
+    GlobalPtr()
+    {
+        m_hGlobal = NULL;
+    }
+
     // allocates a block of given size
-    GlobalPtr(size_t size, unsigned flags = GMEM_MOVEABLE)
+    void Init(size_t size, unsigned flags = GMEM_MOVEABLE)
     {
         m_hGlobal = ::GlobalAlloc(flags, size);
         if ( !m_hGlobal )
             wxLogLastError(_T("GlobalAlloc"));
     }
 
+    GlobalPtr(size_t size, unsigned flags = GMEM_MOVEABLE)
+    {
+        Init(size, flags);
+    }
+
     ~GlobalPtr()
     {
         if ( m_hGlobal && ::GlobalFree(m_hGlobal) )