STR

(1) Run LibreOffice with command line parameter --base.  Program
    displays dialog "Database Wizard" step 1 "Select database.

(2) Click on radio button "Connect to existing database".  Program
    enables the dropdown list right below; the displayed entry is
    JDBC.

(3) Click on the down-arrow to the right of JDBC.  The program opens
    the dropdown list with entries JDBC, Oracle JDBC, and so forth;
    JDBC is selected.

(4) In the dropdown list,click on Spreadsheet.
    Expected : The program closes the dropdown list and Spreadsheet is
               selected.
    Observed : The dropdown list says open and JDBC remains selected.

The obvious workaround is to use up-arrow and down-arrow keys to
select the list item.  This is easy and effective, so I am setting
severity minor.

Working in the daily dbgutil bibisect repostitory, I see that the
problem came into LibreOffice between 2015-12-14 and 2015-12-15.  The
respective source hashes are 63feac2 and e0d2acf, covering 38 commits.
To my uneducated eye, the most likely culprit is e9ac45d "unusedcode
NotifyEvent::NotifyEvent()".  Are you interested, Juergen?

I shall set kewords regression and bibisected.