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
endOffset= fEndOffset.getRememberedOffset(newEndElement);
					revealEndOffset= fEndOffset.getRevealOffset(newEndElement, endOffset);
					if (revealEndOffset == -1)
						endOffset= -1;
				} else {
					startOffset= fStartOffset.getOffset();
					revealStartOffset= startOffset;
					endOffset= fEndOffset.getOffset();
					revealEndOffset= endOffset;
				}
				
				if (startOffset == -1) {
					startOffset= endOffset; 
					revealStartOffset= revealEndOffset;
				}
				
				if (endOffset == -1) {
					endOffset= startOffset; 
					revealEndOffset= revealStartOffset;
				}
				
				IJavaElement element;
				if (endOffset == -1) {
					 
					element= fEndOffset.getElement();
					if (element == null)
						element= fStartOffset.getElement();
					if (element != null)
						setSelection(element);
					return;