No changes, just refactor wxMSW wxComboBox code calling GetComboBoxInfo().

Move the code dynamically loading this function to the base wxChoice class to
make it possible to use it from there in the upcoming commit.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72953 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/combobox.cpp

@@ -39,7 +39,6 @@
 #endif
 
 #include "wx/clipbrd.h"
-#include "wx/dynlib.h"
 #include "wx/wupdlock.h"
 #include "wx/msw/private.h"
 
@@ -378,26 +377,9 @@ bool wxComboBox::MSWShouldPreProcessMessage(WXMSG *pMsg)
 
 WXHWND wxComboBox::GetEditHWNDIfAvailable() const
 {
-#if wxUSE_DYNLIB_CLASS
-#if defined(WINVER) && WINVER >= 0x0500
-    typedef BOOL (WINAPI *GetComboBoxInfo_t)(HWND, COMBOBOXINFO*);
-    static GetComboBoxInfo_t s_pfnGetComboBoxInfo = NULL;
-    static bool s_triedToLoad = false;
-    if ( !s_triedToLoad )
-    {
-        s_triedToLoad = true;
-        wxLoadedDLL dllUser32("user32.dll");
-        wxDL_INIT_FUNC(s_pfn, GetComboBoxInfo, dllUser32);
-    }
-
-    if ( s_pfnGetComboBoxInfo )
-    {
-        WinStruct<COMBOBOXINFO> info;
-        (*s_pfnGetComboBoxInfo)(GetHwnd(), &info);
+    WinStruct<COMBOBOXINFO> info;
+    if ( MSWGetComboBoxInfo(&info) )
         return info.hwndItem;
-    }
-#endif // WINVER >= 0x0500
-#endif // wxUSE_DYNLIB_CLASS
 
     if (HasFlag(wxCB_SIMPLE))
     {