ability to set primary attachment for the "view" button in the parent item

[erazlogo]

The button is "view snapshot" in websites or "view" in other item types. Here is a summary of an IM w/ Dan S. on this:

At the moment the button returns the most recent snapshot matching the URI field. The current behavior works for things like newspaper articles but not so well for other things. For example, what if you have a stable URI in the parent item but snapshot is from another, less stable, website that has full text? The current behavior is not very intuitive/helpful.

But the button also could be much more useful if users could assign attachments to it. For example, say you have a .mov file of an interview that you're analyzing (with Elena's plugin) but then also want to add other .mov files that are parts of the same interview. You'd still want the entire interview to be the main "snapshot" so you can attach notes to particular time codes on that file. And this is not going to work with the current system.

It is probably possible to reuse the existing code for this, in an old revision for back when you could set a note as an abstract.

[dstillman]

(In [4582]) - Changed View/View Snapshot logic to following order: oldest PDF attachment matching parent URL, oldest non-PDF attachment matching parent URL, oldest PDF attachment not matching URL, old non-PDF attachment not matching URL, live URL, resolved DOI

• Double-clicking My Library takes you to online library
• Triple-clicking, rather than double-clicking, now expands/collapses parent items, which no one will notice or care about because I'm apparently the only person in the world who previously double-clicked to expand parent items. I feel so alone.

Closes #905, "ability to set primary attachment for the "view" button in the parent item" -- I think this is as close as we're gonna get.

[dstillman]

Milestone 2.0 Beta 3 deleted