I have a view that is using a solr index. Have a few 'Search: Fulltext search' exposed filters (e.g. Name, Notes, Place) with each of the filter having different 'Searched fields' assigned. Highlighting is enabled.
If only one of the filters is used then the keywords are highlighted in the search results. However, when more than 1 exposed filter is used (e.g. smith in Name filter and letter in Notes filter, the results are returned properly but only the keywords in Name are highlighted. If I adjust the orders of the filters in the view configuration so that the Notes exposed filter is above the Name filter then only the keywords in the Notes filter are returned. It would be useful if keywords in both filters are highlighted in the search results.
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Thanks for reporting this problem. I can see why this would be happening, but unfortunately the solution is not that simple for architectural reasons.
I will look into it when I have a bit more time (i.e., less issues in my backlog).
(Note to future self: One idea would be to set some “please also highlight these keys” option in the SearchApiFulltext filter class and use those keys, too, in Highlight.)