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A feature that would be nice would be auto saving of files while editing should the program exit abnormally. An alternative would be having a temporary working file from which a recovery could be made. Under the latter, the file would be deleted upon exit after saving. Should the program exit abnormally or a system crash occur, the working files would not have been deleted and could be used for recovery. If the feature already exists, I could not find it which is why I am suggesting the feature.
This should be classified as an enhancement.
Already requested, but thanks for your interest in Netbeans editor. *** This issue has been marked as a duplicate of 106704 ***