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Spell-checking for Twig files would be a 'nice to have' feature.
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
I just opened a new bug for this. See https://netbeans.org/bugzilla/show_bug.cgi?id=268176