fixed mem leak when using non default theme; change the art provider automatically when the theme is changed (patch 646463)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@18070 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/appcmn.cpp

@@ -121,9 +121,6 @@ bool wxAppBase::OnInitGui()
 #ifdef __WXUNIVERSAL__
     if ( !wxTheme::Get() && !wxTheme::CreateDefault() )
         return FALSE;
-    wxArtProvider *art = wxTheme::Get()->GetArtProvider();
-    if ( art )
-        wxArtProvider::PushProvider(art);
 #endif // __WXUNIVERSAL__
 
     return TRUE;
@@ -385,6 +382,8 @@ bool wxAppBase::OnCmdLineParsed(wxCmdLineParser& parser)
             return FALSE;
         }
 
+        // Delete the defaultly created theme and set the new theme.
+        delete wxTheme::Get();
         wxTheme::Set(theme);
     }
 #endif // __WXUNIVERSAL__