Bug 63898 [reconciling] Multiple threads calling IJavaReconcilingListener#reconciled() at the same time
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/CompilationUnitEditor.java
int fOffset;
		int fLength;
		LinkedModeUI fUI;
		Position fFirstPosition;
		Position fSecondPosition;
	}
	
	/**
	 * Position updater that takes any changes at the borders of a position to not belong to the position.
	 * 
	 * @since 3.0
	 */
	private static class ExclusivePositionUpdater implements IPositionUpdater {
		
		private final String fCategory;
		/**
		 * Creates a new updater for the given <code>category</code>.
		 * 
		 * @param category the new category.
		 */
		public ExclusivePositionUpdater(String category) {