Current situation

Currently, the navigation panel is displaying pages which have a version corresponding to the selected one only.

For example, for a page A which has a v1 content and a v3, if v2 is selected, page A is hidden.

Expected situation

The navigation panel should also display pages if they can inherit content, because they still are "existing" in the version. In the example above, page A should be displayed if v2 is the selected version.

The only cases where they shouldn't be displayed is if they don't exist in a previous version (page introduced in V3 for instance) or if they are removed after a version (feature not developed yet)