Extract CreateSeparatedSizer() from wxDialog::CreateSeparatedButtonSizer().

Extract the code adding a separating wxStaticLine to the sizer in its own
function to be able to reuse it in upcoming commits.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65448 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dlgcmn.cpp

@@ -218,12 +218,8 @@ wxSizer *wxDialogBase::CreateButtonSizer(long flags)
 #endif // __SMARTPHONE__/!__SMARTPHONE__
 }
 
-wxSizer *wxDialogBase::CreateSeparatedButtonSizer(long flags)
+wxSizer *wxDialogBase::CreateSeparatedSizer(wxSizer *sizer)
 {
-    wxSizer *sizer = CreateButtonSizer(flags);
-    if ( !sizer )
-        return NULL;
-
     // Mac Human Interface Guidelines recommend not to use static lines as
     // grouping elements
 #if wxUSE_STATLINE && !defined(__WXMAC__)
@@ -237,6 +233,15 @@ wxSizer *wxDialogBase::CreateSeparatedButtonSizer(long flags)
     return sizer;
 }
 
+wxSizer *wxDialogBase::CreateSeparatedButtonSizer(long flags)
+{
+    wxSizer *sizer = CreateButtonSizer(flags);
+    if ( !sizer )
+        return NULL;
+
+    return CreateSeparatedSizer(sizer);
+}
+
 #if wxUSE_BUTTON
 
 wxStdDialogButtonSizer *wxDialogBase::CreateStdDialogButtonSizer( long flags )