Entry Editor removes entries when in souce-code-field

[JoKalliauer]

JabRef version 5.0-dev on Ubuntu 18.04

JabRef 5.0-dev--snapshot--2019-03-15--master--7ed15bc4a
Linux 4.15.0-46-generic 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. Open 4764.bib
2. double click on "Rechnergestütze Simulation von Anfahrversuchen nach EN 1317"
3. go to "BibTeX-source code" (in the newest dev-version be aware of the workaround #4762#issue-421323351, but "my bug" also ocours in a february-version)
4. click anywhere into the source-code-field
5. click on "Misc"-"DNA-Dennis"-"CoulombsLaw.svg pblished under CC-BY 3.0"
6. save
7. check output.bib.txt (the "Misc"-"DNA-Dennis"-"CoulombsLaw.svg pblished under CC-BY 3.0" disapeared)

Detail information:

Can only load style files: Preview
Can only load style files: Preview
Can only load style files: Preview
Can only load style files: Preview
Can only load style files: Preview

Terminal

java -jar -Djavafx.embed.singleThread=true /home/jkalliau/prgm/JabRef/JabRef--master--latest.jar 4633.bib

16:17:39.557 [JavaFX Application Thread] INFO  org.jabref.logic.importer.OpenDatabase - Opening: 4633.bib
16:17:39.803 [JavaFX Application Thread] INFO  org.jabref.logic.importer.OpenDatabase - Opening: /home/jkalliau/ownCloud/PhDJK/LaTeX/Style/LiteratureJK.bib
16:17:40.907 [JavaFX Application Thread] ERROR org.jabref.logic.citationstyle.CitationStyle - Can only load style files: Preview
16:17:40.982 [JavaFX Application Thread] ERROR org.jabref.logic.citationstyle.CitationStyle - Can only load style files: Preview
16:17:47.312 [JavaFX Application Thread] ERROR org.jabref.logic.citationstyle.CitationStyle - Can only load style files: Preview

[Siedlerchr]

Confirmed: when I click in the source field and then select another entry in the table, the bib entry codes changes to the first selected one.
Log informs about autosave:

12:44:23.668 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.706 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.717 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.737 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.749 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.797 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.808 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.820 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.838 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.879 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.928 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.952 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:23.994 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.060 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.077 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.140 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.175 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.380 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.402 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.653 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.710 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  
12:44:24.725 [JavaFX Application Thread] DEBUG org.jabref.logic.autosaveandbackup.BackupManager - Rejecting while another backup process is already running. -  

[CaptainDaVinci]

I think this is because when the sourceTab is out of focus (when another entry is selected), the storeSource() method is called with the previous sourceText but the currentEntry refers to the second entry and the field values of first one are copied to the second one.

One possible solution might be to maintain a previousEntry field along with currentEntry which is updated every time notifyAboutFocus() is called.
Edit: The proposed solution will break saving on losing focus.

[Siedlerchr]

Thanks to @CaptainDaVinci this should be fixed in the latest master. https://builds.jabref.org/master