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For Ruby there is NetBeans->Preferences->Ruby->Hints filled with checkboxes corresponding to different hints and their state. There's nothing like that for Javascript and I do not know how to re-enable a hint that I disabled. Which config file should I edit to achieve that?
Ruby has a top level category, just like Java does - for formatting settings, hint selection, etc. There has been a UI spec for a while asking for these top level categories to go away and to be replaced by a general editor panel (with more sub settings per language, the way we do it for the color&font chooser). For that reason, I didn't add a UI for JavaScript since these were supposed to go away. For now, to reset your hint options, go to your user directory, and locate this folder: config/Preferences/org/netbeans/modules/gsf/default It will contain individual files for disabled hints, such as text_javascript_AccidentalAssignment.properties which contains #Wed Jun 18 15:35:25 PDT 2008 enabled=false I will add a hint setting as soon as the options rewrite is done for Java/Ruby - this is tracked in issue 137318.
This works from NB 8.0