Bug 43488 [typing] BadPositionCategoryException in LinkedPositionManager
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaEditor.java
} else {
				
			IRegion region= viewer.getVisibleRegion();			
			if (!includes(region, fActiveRegion))
			 	return;		    
				offset= fActiveRegion.getOffset() - region.getOffset();
				length= fActiveRegion.getLength();
			}
			
			
			Point minLocation= getMinimumLocation(text, offset, length);
			Point maxLocation= getMaximumLocation(text, offset, length);
	
			int x1= minLocation.x;
			int x2= minLocation.x + maxLocation.x - minLocation.x - 1;
			int y= minLocation.y + text.getLineHeight() - 1;
			
			GC gc= event.gc;
			if (fColor != null && !fColor.isDisposed())
			gc.setForeground(fColor);
			gc.drawLine(x1, y, x2, y);
		}
		private boolean includes(IRegion region, IRegion position) {
			return
				position.getOffset() >= region.getOffset() &&
				position.getOffset() + position.getLength() <= region.getOffset() + region.getLength();
		}
		private Point getMinimumLocation(StyledText text, int offset, int length) {
			Point minLocation= new Point(Integer.MAX_VALUE, Integer.MAX_VALUE);