Bug 88352 Operation supports leaks contexts via action handler
I20050315-1100 Susan, this is a different leak from the one that I reported. Test Case: 1. open text editor 2. close text editor ==> DefaultUndoManager is leaked due to undo/redo actions handlers still holding on to the context.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/DefaultOperationHistory.java
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#remove(org.eclipse.core.commands.operations.IUndoableOperation)
	 */
	public void remove(IUndoableOperation operation) {
		if (undoList.contains(operation)) {
			undoList.remove(operation);
			internalRemove(operation);
		} else if (redoList.contains(operation)) {
			redoList.remove(operation);
			internalRemove(operation);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#removeOperationApprover(org.eclipse.core.commands.operations.IOperationApprover)
	 */
	public void removeOperationApprover(IOperationApprover approver) {
		approvers.remove(approver);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.core.commands.operations.IOperationHistory#removeOperationHistoryListener(org.eclipse.core.commands.operations.IOperationHistoryListener)
	 */
	public void removeOperationHistoryListener(
			IOperationHistoryListener listener) {