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If you edit ant script in editor and also you have expanded some nodes from the same script represented in Explorer - after editing by hand in editor and reparsing, all nodes are colapsed. IDE was running in MDI mode.
Cannot easily fix without having some XML support that fires structural diffs after a reparse. Will not fix solely for benefit of Ant module.
Verified.
Resolved for 3.3.x or earlier, no new info since then -> closing.