Copy treeViewLeftPanel settings from Seadragon extension. - Fixes NaN issues in thumbnail display.
Copy treeViewLeftPanel settings from Seadragon extension.
- Fixes NaN issues in thumbnail display.

britishlibrary/UniversalViewer,britishlibrary/UniversalViewer,britishlibrary/UniversalViewer,WSULib/universalviewer,dalbymodo/universalviewer,WSULib/universalviewer,dalbymodo/universalviewer,WSULib/universalviewer,WSULib/universalviewer,britishlibrary/UniversalViewer,dalbymodo/universalviewer,WSULib/universalviewer,dalbymodo/universalviewer,britishlibrary/UniversalViewer,WSULib/universalviewer,britishlibrary/UniversalViewer,dalbymodo/universalviewer,dalbymodo/universalviewer