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When adding libraries to a project the process should be recursive, i.e. Select a folder then all subfolders are checked for libraries and found libraries are added to the project. A better option would be to display a list of found libraries to the user with checkboxes. The user could then check a box to include the library or uncheck the box to exclude the libray. The reson for this is because I use subfolders under 'lib' to group libraries from the same vendor or for classification.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss