Revive option to switch between tab-specific and global search

[ytzemih]

Is your suggestion for improvement related to a problem? Please describe.
In JR3/4, I was able to enter a search term and change between tabs and browse the different search results (that were carried through simultaneously for each file after hitting Enter).
I am severely missing this option in JR5. At least, I was unable to find it.
(Using JabRef 5.0-pull-5945-merge.440--2020-02-19--fcaeef1)

Describe the solution you'd like
I don't know whether the tab-specific search is a feature or a bug.
However, I suggest to have an option in the setting that allows one to switch between

1. tab-specific search (the search field content is changed simultaneously with the tab change) and
2. global search (the search field content is applied to all open tabs like in JR3/4)

Thanks.

[Siedlerchr]

Duplicate of #4096