How can I override an already overriden template by jbot?

Question

I'm making a Plone theme that uses plonetheme.bootstrap as base skins.

I want to customize the portaltab viewlet, so I use plone.app.themeplugin's override plugin and add my plone.app.layout.viewlets.sections.pt into overrides folder.

That didn't work, while other template does. Later I found out that it's because plonetheme.bootstrap had already overridden it.

So how can I override an already overridden template? And how is a BrowserLayer picked when there are so many?

Answer 1

Thanks Mikko Ohtamaa and David Glick for the tip and the information.

I subclassed plonetheme.bootstrap layer instead of the default one and it worked. You'll also need to add that layer into Diazo theme's browserlayer through manifest.cfg, eg:

[theme:browserlayer]
layer1 = lanlankernel.theme2013.browser.interfaces.IThemeSpecific

There must be a way, may be a patch in plone.app.themeplugin, to make sure the layer that's auto-generated by the browserlayer plugin is on top of the lookup chain. But the current solution works for me so I marked the question as answered.