Edit group window to large (even at screen size 1920px) and not shrinking when the window is resized

[bernhard-kleine]

JabRef 5.0-dev--snapshot--2019-02-19--master--1b6c7b5b9
Windows 7 6.1 amd64
Java 1.8.0_201

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

Steps to reproduce the behavior:

1. Opening "Edit group" the display for this window is so large that the ???? buttons on the bottom of the screen are not visible. It is not possible to resize the window.
2. ...
3. ...

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[tobiasdiez]

Should be fixed with #4660.