Plone toolbar Display menu may not be shown even if you have several faceted layouts

[laulaz]

There is an issue in the way eea.facetednavigation inserts its layouts into the Plone Display menu.

If your type has only one available view (example : summary_view on Collection), the Plone Display menu available() method returns False and the faceted menu items insertion does not occur.
(https://github.com/plone/plone.app.contentmenu/blob/df5f2e290eb5d8cc98a2eb692d35eae6cd96a2d7/plone/app/contentmenu/menu.py#L177).

Thus, the Display menu is hidden even if you have several faceted layouts defined !