Social Links feature doesn't display on Item pages which do not scroll

[tdonohue]

Describe the bug

Discovered in testing of #5112. The Social Links hover-over bar will only appear on pages that require scrolling. This is usually not an issue for homepages and similar.

However, if you have an Item page which doesn't scroll (i.e. it has less metadata and is smaller vertically) then it's not possible to get the Social Links to display unless you make your window smaller (to make a scrollbar appear).

To Reproduce

Steps to reproduce the behavior:

1. Enable the Social Links feature added in [DSpace-CRIS] Share links via social networks #5112

   addToAnyPlugin:
     socialNetworksEnabled: true
   

2. Create (or locate) an Item whose Item page doesn't scroll. For example, create an Item that has minimal metadata (e.g. just a title, single author and date)
3. Browse to that Item's page. Notice the Social Links bar does not appear at the bottom of the page.
4. Now resize your browser window so that it is smaller vertically. This will cause a scrollbar to appear.
5. Scroll the window and the Social Links bar will now appear.

Expected behavior

Ideally, this bar should be visible on all pages, or there should be a button available to make it appear (if hidden because of a lack of a scrollbar). Having it appear only if a scrollbar exists is inconsistent behavior.

Related work

This feature was first added in #5112

[guillermo-escire]

Hi @tdonohue, I'm a partner at @jtimal, could you please assign me this issue to work on?

[tdonohue]

Sure @guillermo-escire ! Thanks for volunteering. Please keep in mind that this social links bar should not block the footer on pages that don't scroll. We don't want the social links to hide existing content altogether, but we need a way for it to still appear on all pages.

If you end up finding this is more difficult than it may seem, let us know and we can always reassign it.