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This used to work in 3.4.1 - Invoke the find in files menu item - enter some search string - Wait till the results are populated - Now go modify one of the found files by removing the search string from the file. - Compile the file - Bug: the file is still in the found list.
The "dynamic search results" feature was removed from NetBeans in version 3.5 (see issue #30613). I forgot to put it into the release notes.