Dataset Page: Download button for tabular file has dropdown but is cut off if near the bottom of the list of files

[pdurbin]

Originally reported by @rmo-cdsp at http://irclog.iq.harvard.edu/dataverse/2017-05-16#i_52784 for v. 4.6.1 build 69-1ed82ae

In the example below the last tabular file is "004_Nigeria-Cassava_Sociodemographic.tab" from https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/29604 . Notice how the dropdown is hidden:

Dropdown cut off due to being at end of list of files

What you should see is all the stuff in the drop down, such as for this file that's higher up in the file list:

Dropdown not cut off

[dlmurphy]

Just checked, and this bug is appearing on my own setup as well. One can work around the bug by opening the dropdown and then scrolling down while the dropdown is open. This workaround is definitely not intended behavior, it's very difficult to pull off, and it's not at all telegraphed to the user. This bug puts a significant roadblock in the way of half of the file's download options, so it strikes me as pretty significant.

[pdurbin]

@rbhatta99 took at look at the code this morning and has some ideas that we talked about. I asked him to get in touch with @mheppler .