Fix bug with tooltip in interacting.html, this makes the tooltip much smoother (fix by bdkahn)

git-svn-id: https://flot.googlecode.com/svn/trunk@274 1e0a6537-2640-0410-bfb7-f154510ff394

NEWS.txt

@@ -102,6 +102,8 @@ Bug fixes:
   arrays, patch by vpapp1).
 - Fix errors in JSON in examples so they work with jQuery 1.4.2
   (fix reported by honestbleeps, issue 357).
+- Fix bug with tooltip in interacting.html, this makes the tooltip
+  much smoother (fix by bdkahn).
 
 
 Flot 0.6

examples/interacting.html

@@ -62,8 +62,8 @@ $(function () {
 
         if ($("#enableTooltip:checked").length > 0) {
             if (item) {
-                if (previousPoint != item.datapoint) {
-                    previousPoint = item.datapoint;
+                if (previousPoint != item.dataIndex) {
+                    previousPoint = item.dataIndex;
                     
                     $("#tooltip").remove();
                     var x = item.datapoint[0].toFixed(2),