Editing the Bibtexkey troublesome while the library is sorted on the bibtexkey

[bernhard-kleine]

JabRef 5.0-dev--snapshot--2019-03-19--master--90376f40f
Windows 7 6.1 amd64
Java 1.8.0_201

When I try to edit the bibtexkey, once the I type a single letter, jabref saves that change, and when the order according to the bibtexkey is changed, changes the order accordingly, and jumbs to the first item of the entry editor, here the author. When you type the second letter, missing this jumb because it is unexpected, the author field is also changed to the second letter. Extremely troublesome.
Steps to reproduce the behavior:

1. sort a library by the bibtexkey
2. open the entry editor
3. select the bibtexkey
4. type a letter, different from the one which is there
5. type a second letter and the author field is changed.

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