Add standard art providers at the bottom of the art providers stack.

This ensures that any user-defined art providers will be in front of them,
even when they are added at module-initialization time i.e. possibly before
the standard ones.

Closes #12519.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70154 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/artprov.cpp

@@ -440,13 +440,16 @@ class wxArtProviderModule: public wxModule
 public:
     bool OnInit()
     {
-#if wxUSE_ARTPROVIDER_STD
-        wxArtProvider::InitStdProvider();
-#endif // wxUSE_ARTPROVIDER_STD
+        // The order here is such that the native provider will be used first
+        // and the standard one last as all these default providers add
+        // themselves to the bottom of the stack.
+        wxArtProvider::InitNativeProvider();
 #if wxUSE_ARTPROVIDER_TANGO
         wxArtProvider::InitTangoProvider();
 #endif // wxUSE_ARTPROVIDER_TANGO
-        wxArtProvider::InitNativeProvider();
+#if wxUSE_ARTPROVIDER_STD
+        wxArtProvider::InitStdProvider();
+#endif // wxUSE_ARTPROVIDER_STD
         return true;
     }
     void OnExit()