Fix rendering glitch for long sequence reads.
Fix rendering glitch for long sequence reads.

Traksewt/dalliance,dasmoth/dalliance,limeng12/dalliance,bartcharbon/dalliance,jeffhsu3/dalliance,dasmoth/dalliance,jeffhsu3/dalliance,Traksewt/dalliance,limeng12/dalliance,warelab/dalliance,bartcharbon/dalliance,ENCODE-DCC/dalliance,warelab/dalliance,ENCODE-DCC/dalliance