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(-)a/editor.fold.support/src/org/netbeans/modules/editor/fold/support/FoldMaintainerImpl.java (+3 lines)
Lines 194-199 Link Here
194 
                    FoldHierarchy hierarchy = getOperation().getHierarchy();
 194 
                    FoldHierarchy hierarchy = getOperation().getHierarchy();
195 
                    hierarchy.lock();
 195 
                    hierarchy.lock();
196 
                    try {
 196 
                    try {
197 
                        if (getOperation().isReleased() || installedFolds == null) {
198 
                            return;
199 
                        }
197 
                        FoldHierarchyTransaction t = getOperation().openTransaction();
 200 
                        FoldHierarchyTransaction t = getOperation().openTransaction();
198 
                        try {
 201 
                        try {
199 
                            for (Iterator remove = removedFolds.iterator(); remove.hasNext(); ) {
 202 
                            for (Iterator remove = removedFolds.iterator(); remove.hasNext(); ) {

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