Web search results highlights multiple lines when selecting entries

[farmercr]

JabRef version: JabRef 5.0-dev--snapshot--2019-06-04--master--9a5b7d1c3 on Windows 8.1 6.3 amd64

• I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists

When selecting results from a web search and scrolling, multiple entries will turn light blue as if they were also selected. Functionality still appears to work correctly. The extra highlighting makes it harder for the user to know which entries were actually selected.

Steps to reproduce the behavior:

1. Open web search
2. Enter search criteria
3. Click Search button
4. In search results window, select an entry to import
5. Scroll down and back up through the entries
6. Select another entry to import
7. Multiple entries turn blue, even though they were not selected
8. Only selected entries will actually be imported

[CyraxSector]

@tobiasdiez I'm working on this