update trackview scrollbars when content height changes
update trackview scrollbars when content height changes

NabaviLab/CNV-Visualizer,igvteam/igv.js,NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer,igvteam/igv.js,NabaviLab/CNV-Visualizer