Trying to rearrange the welcome tab causes an exception

[Zurtar]

JabRef version

Latest development branch build (please note build date below)

Operating system

Windows

Details on version and operating system

Build date: 2025-04-11

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

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

Steps to reproduce the behaviour

1. Disable the setting to "Hide Tab bar when single library is present"
2. Create a library (Or create 2 if you skipped step 1)
3. Click and drag the Welcome tab and move it beside the newly created library
4. Error occurs

Appendix

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Log File

Paste an excerpt of your log file here

[harshithsaiv]

Hi @Siedlerchr I'd like to work on this issue.

From the exception, it looks like the WelcomeTab is being incorrectly treated as a LibraryTab, possibly during tab reordering. I believe this is due to type assumptions.

• I’ll first identify where the Tab list is being accessed and cast to LibraryTab.
• I’ll add proper instanceof checks to safely handle mixed tab types (WelcomeTab, LibraryTab, etc.).
• I’ll also include a unit/integration test to reproduce this drag-and-drop scenario and ensure it doesn’t crash.

Please assign this issue to me. I'd be happy to take it forward.

[github-actions]

👋 Hey @harshithsaiv, looks like you’re eager to work on this issue—great! 🎉 It also looks like you skipped reading our CONTRIBUTING.md, which explains exactly how to participate. No worries, it happens to the best of us. Give it a read, and you’ll discover the ancient wisdom of assigning issues to yourself. Trust me, it’s worth it. 🚀

[harshithsaiv]

/assign-me

[github-actions]

👋 Hey @harshithsaiv, thank you for your interest in this issue! 🎉

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[koppor]

@harshithsaiv

• I’ll also include a unit/integration test to reproduce this drag-and-drop scenario and ensure it doesn’t crash.

I am very curious how you are going to manage that.

The text seems to be generated by an AI - or do you really know how to run TestFX or other UI testing frameworks?

[harshithsaiv]

Hi @koppor , I have knowledge about testing frameworks like Junit , TestNG and I wanted to write test case in TestFx so that we will be able to catch such UI errors

[koppor]

@harshithsaiv Sounds good. Looking forward!

[github-actions]

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