See https://github.com/apache/isis/blob/master/core/viewer-wicket-ui/src/main/java/org/apache/isis/viewer/wicket/ui/components/widgets/themepicker/ThemeChooser.java#L112-L123 for inspiration.

Since this ticket was raised, the @CollectionLayout has been enhanced so can specify the default view. So the problem is less of an issue than previously.

Commit ca94ac6edebb6c7c6a517b09e7c560b31df0579e in isis's branch refs/heads/master from Dan Haywood
[ https://git-wip-us.apache.org/repos/asf?p=isis.git;h=ca94ac6 ]

ISIS-1239: refactored hints, now correctly serialized into session (once more), and can grab as a copy. This also includes the remembering of state when revisit page (even if no hints explicitly grabbed).

Commit 4672aefa73db3b10612c52c8d8c6fd7a117398d2 in isis's branch refs/heads/master from Dan Haywood
[ https://git-wip-us.apache.org/repos/asf?p=isis.git;h=4672aef ]

ISIS-1239, ISIS-1324, ISIS-1328: multi-select for standalone collections was broken, now fixed.

Issue was that earlier work moved entire responsibility for being the "UiHintContainer" onto the EntityModel, on the basis that only entities can store hints over time. However, the selector drop-down for standalone collections also was storying the hint on the UiHintContainer, which previously was also supported by (standalone) EntityCollectionModel. This meant that the hint got lost. Fix for that is to allow the IsisUiHintEvent to also directly hold the hint info.

In addition, the algorithm for selecting the default view was broken for standalone collections; should default to "table" if a standalone and there is no other metadata available.