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The explorer nodes displayed under a .g file (header, options, lexers, parsers, treeparsers) need to be implemented. There is some code in the repository to support this now, but it needs to be hooked up and probably updated. The subnodes under each of these could be options or rules (productions) and double clicking on any subnode should (open and) move the editor to the start of that section, class, production etc. For example behavior see the ant module where the properties, taskdefs and targets are displayed.
*** This issue has been marked as a duplicate of 17534 ***