Updates to fix dialogs for non-target lesions.

Packages/viewerbase/lib/enablePrefetchOnElement.js

@@ -0,0 +1,23 @@
+/**
+ * This function enables stack prefetching for a specified element (viewport)
+ * It first disables any prefetching currently occurring on any other viewports.
+ *
+ * @param element {node} DOM Node representing the viewport element
+ */
+enablePrefetchOnElement = function(element) {
+    log.info("imageViewerViewport enablePrefetchOnElement");
+
+    // Loop through all viewports and disable stackPrefetch
+    $('.imageViewerViewport').each(function() {
+        if (!$(this).find('canvas').length) {
+            return;
+        }
+        cornerstoneTools.stackPrefetch.disable(this);
+    });
+
+    // Make sure there is a stack to fetch
+    var stack = cornerstoneTools.getToolState(element, 'stack');
+    if (stack && stack.data.length && stack.data[0].imageIds.length > 1) {
+        cornerstoneTools.stackPrefetch.enable(element);
+    }
+};