Added persistent single-image measurments (length, ellipse) (LT-37, LT-156)

Packages/viewerbase/lib/updateAllViewports.js

@@ -0,0 +1,6 @@
+updateAllViewports = function() {
+    var viewports = $('.imageViewerViewport').not('.empty');
+    viewports.each(function(index, element) {
+        cornerstone.updateImage(element);
+    });
+};