Position (width) of Preview inside entry editor not remembered

[Siedlerchr]

JabRef version

Latest development branch build (please note build date below)

Operating system

macOS

Details on version and operating system

No response

Checked with the latest development build (copy version output from About dialog)

• [X] I made a backup of my libraries before testing the latest development version.
• [X] I have tested the latest development version and the problem persists

Steps to reproduce the behaviour

1. Open the entry editor
2. Adjust the preview window position on the right, e.g. reduce the width
3. Close JabRef and restart => The window position is reset

Step 2:

After restarting JabRef

Implementation details: The EntryEditorPreferences need to be enhanced with a new Property for the Preview Position, similar to how it's done for the divider position which remembers the height.

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