1. Create a new library "demo.bib"

2. Add new entry

3. In "BibTeX source", add icore = {abc}

   @Article{demo,
   icore = {abc}
   }

4. Library properties

5. Add "Content selectors" for ICORE

6. File > Preferences > Entry table

7. Add custom column "ICORE"
   

8. Save, restart JabRef

See at tab "Other fields", there is are the contents displayed

However, clicking on the field on the main table does not do anything:

There is something done for the viewed field:

Task: Similar behavior should happen for fields with a content selector.

Hints:

1. Possible field values can be read from databaseContext.getMetaData().getContentSelectorValuesForField(field)
2. Adapt org.jabref.gui.maintable.MainTableColumnFactory#createColumn to handle the case if the are content selector values and display them
3. org.jabref.gui.maintable.columns.ContentSelectorColumn similar to org.jabref.gui.maintable.columns.SpecialFieldColumn#SpecialFieldColumn (but more easy - just use OptionalValueTableCellFactory`