Override a viewlet (ConfigurationConflictError, Conflicting configuration actions)

1

During eggification of my old-style product, I moved a viewlet to a new eggified package; now I get a ConfigurationConflictError:

zope.configuration.config.ConfigurationConflictError: Conflicting configuration actions
  For: ('viewlet', <InterfaceClass zope.interface.Interface>, <InterfaceClass zope.publisher.interfaces.browser.IDefaultBrowserLayer>, <InterfaceClass zope.browser.interfaces.IBrowserView>, <InterfaceClass plone.app.layout.viewlets.interfaces.IHtmlHead>, u'plone.htmlhead.title')
    File "/opt/zope/common/eggs/plone.app.layout-2.3.11-py2.7.egg/plone/app/layout/viewlets/configure.zcml", line 198.4-203.10
          <browser:viewlet
              name="plone.htmlhead.title"
              manager=".interfaces.IHtmlHead"
              class=".common.TitleViewlet"
              permission="zope2.View"
              />
    File "/.../src/my.package/src/my/package/configure.zcml", line 12.4-17.10
          <browser:viewlet
              name="plone.htmlhead.title"
              manager="plone.app.layout.viewlets.interfaces.IHtmlHead"
              class=".overrides.title.TitleViewlet"
              permission="zope2.View"
              />

What are my options; do I need a monkey-patch, or is there some other possibility?

I could not find the browser:viewlet directive on https://docs.zope.org/zope3/ZCML/@@staticmenu.html nor https://zopecomponent.readthedocs.io/en/latest/index.html.

2

You can override a viewlet with a layer

          <browser:viewlet
              name="plone.htmlhead.title"
              manager="plone.app.layout.viewlets.interfaces.IHtmlHead"
              class=".overrides.title.TitleViewlet"
              permission="zope2.View"
              layer="my.package.interfaces.IMyPackageLayer"
              />
3

indeed: https://docs.plone.org/develop/plone/views/more_view_examples.html

4

@csanahuja, @hvelarde: Thank you -- this seems to have worked. I have created a layer and added a profile.