Save order of columns across sessions

[tobiasdiez]

After the user reorder the columns of the maintable per drag and drop, these changes are now saved in the preferences. Moreover, I refactored a bit how preferences are loaded from the global preferences class.

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• Change in CHANGELOG.md described
• Tests created for changes
• Manually tested changed features in running JabRef
• Screenshots added in PR description (for bigger UI changes)
• Ensured that the git commit message is a good one
• Check documentation status (Issue created for outdated help page at help.jabref.org?)

[Siedlerchr]

Any reason why this has to be static?

[tobiasdiez]

No idea... (the code quality in the preferences tabs is so bad anyway).

[Siedlerchr]

I personally see to reason to have this whole column stuff in the preferences tab anylonger. I think it was only added because we could not save the column reordering the user did directly on the maintable. I would vote to remove that stuff completely.

[tobiasdiez]

Well, currently, this is the only place where you can choose which columns are shown.

[Siedlerchr]

Why not adding a table column selector like it's possible in nearly every table

[Siedlerchr]

Here is an example https://gist.github.com/Roland09/d92829cdf5e5fee6fee9

[tobiasdiez]

This is a good idea! I have to think a bit more about it and how to make it work for JabRef (we allow also columns of the form author/editor and have to many fields to display them all in a drop down - possible a combination of drop down and text field may work). But not as part of this PR.

[Siedlerchr]

Can I still change the order and width in the settings?

[tobiasdiez]

@Siedlerchr Yes, this should still work.