Open collection level by default in hierarchy tree

[siiriylonen]

Open collection level by default in hierarchy tree for user convenience.

[demiankatz]

Thanks for the contribution, @siiriylonen! I think this may require some adjustments, though...

This change will cause every level of the hierarchy tree to be expanded if it is a collection. For large and complex collections, this may result in an overwhelming amount of information to scroll through. Is that really what is intended?

I spoke with @EreMaijala about this, and he thought that the intent might be to only open the top node of the tree if it is a collection and other items are not open/selected. That narrower scope for the special case seems more likely to be universally beneficial (though if "all collections always expanded" is really what you want, maybe we should consider a config setting for that so it doesn't change the default behavior for users that won't want it).

[siiriylonen]

I see, yes the intention here was to only open the one and not many. I'll rethink.

[demiankatz]

Thanks, @siiriylonen! Let me know if I can be of any assistance as you revise. Also note that if you start up the default test environment (with phing startup) it includes some sample collection data that might be useful for testing. To confirm my concerns about the initial version of this code, I just spun up a test instance, turned on collections and hierarchies in config.ini, and then filtered down to the collection.mrc example records. This allowed me to look at a deep nested hierarchy and confirm that all levels opened up with this code.