Steps to reproduce the issue

• Install com_finder 3.0.0 and plugin "Smart Search - Content Pro" 1.0.0
• Create menu of type "Smart Search > Search", allowing empty search (rendering all results) and limit the search to a single category, e.g. "Knowhow"
• Create a content article "This is a testing article" and associate it to the category "Knowhow"
• Run indexer
• Call new search page
  1. Enter some fancy search term like "testasdf123" which definitely does not exist in any content
  2. Enter some other search term like "test" which does exist as a substring of a article title (e.g. "This is a testing article"). "test" is a part of the existing term "testing"
  3. Enter some search term that exists as a full word, like "testing"

Expected result

1. Should return a "No Results Found" message
2. Should return the "This is a testing article"
3. Should return the "This is a testing article"

Actual result

1. Returns ALL content items => Wrong
2. Returns a "No Results Found" message as expected => Wrong
3. Returns the "This is a testing article" => Correct

System information (as much as possible)

• Additionally I have plugin "Smart Search - JEM" running (for indexing), should not matter here.
• Debugging com_finder shows the following:
  • In FinderModelSearch::getResultsTotal() (/components/com_finder/models/search.php, line 355) the condition "if (empty($this->includedTerms))" returns: In case 1) $this->includedTerms is empty, in case 2) $this->includedTerms contains my search term. So in case 1) a query is built which returns ALL records, in case 2) the more complicated query is built and returns an empty result as expected.
  • In FinderIndexerQuery::getIncludedTermIds() (/administrator/components/com_finder/helpers/indexer/query.php, line 402) the condition "if (empty($this->included[$i]->matches))" is empty for case 1) and not empty for case 2)

Both looks weird to me...

Additional comments