Search: no visual clue about selected options

[mlep]

JabRef version

Latest development branch build (please note build date below)

Operating system

GNU / Linux

Details on version and operating system

JabRef 5.4--2021-08-23--29d0c80 Linux 4.19.0-17-amd64 amd64 Java 16.0.2 JavaFX 16+8

Checked with the latest development build

• 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

When searching inside a bib file, there is no visual clue if "regular expression", "case sensitive" and "fulltext search" are active or not: the icons remain the same.

1. Open a bib file (such as https://github.com/JabRef/jabref/blob/main/src/test/resources/testbib/jabref-authors.bib)
2. Type a string in the search bar
3. click/unclick on the "regular expression", "case sensitive" and "fulltext search" icons.
   ==> The list of displayed entries (and the message "Found XY results") changes (so the functions behind the icons work), but the icon appearance remains the same.

Remarks:

• valid for both light and dark themes.
• bug was introduced between JabRef 5.4--2021-08-15--96061b7 and JabRef 5.4--2021-08-16--2f36a33 (maybe related to PR Fix icon color #7994 ?)

Appendix

...

Log File

``` Paste an excerpt of your log file here ```

[mlep]

@calixtus: Thank you for solving this issue. It works well now!