1.Type an expression to be searched in the top search text box and hit enter
2. On the search result page, there is a filter box, type an expression to further narrow down the result.
3. The search is performed all over again, instead of filtering the results.
Ideally filter should narrow down the result.
Also, the same thing works as expected for Advanced search, in other words, filter functionality narrows down the search result when user performs Advanced search and then filters the result using filter text box present on the search results page.
So the filter should narrow down search results, if applied, after Keyword search.
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