Bug 39995 [navigation] Forward history cleared after going back in navigation history
build I20030710 - select a method call to a method in the same class - hit F3 to open the declaration - use the back buttons to go back to the call site - the forward history gets cleared shortly thereafter, making it more difficult to get back to the declaration Seems to only occur for navigations within the same file.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
int start= offset;
	
				offset= anchor;
				int length= document.getLength();
	
				while (offset < length) {
					c= document.getChar(offset);
					if (!Character.isJavaIdentifierPart(c))
						break;
					++offset;
				}
				
				int end= offset;
				
				if (start == end)
					return new Region(start, 0);
				else
					return new Region(start + 1, end - start - 1);
				
			} catch (BadLocationException x) {
				return null;
			}
		}
		IRegion getCurrentTextRegion(ISourceViewer viewer) {
			int offset= getCurrentTextOffset(viewer);				
			if (offset == -1)
				return null;
			IJavaElement input= SelectionConverter.getInput(JavaEditor.this);
			if (input == null)