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org.netbeans.swing.outline.TreePathSupport caches expanded paths. The paths do not seem to be cleared and cause proliferation of node objects, which are held in memory through the paths. After the fix of issue #179435 the expanded path are used just for getExpandedDescendants(), which should be rewritten not to require the cached paths.
Fixed in changeset: 169884:7f69ed7f3c73. http://hg.netbeans.org/main/rev/7f69ed7f3c73