Update excanvas and remove previous eventholder work-around to fix hover/click...

Update excanvas and remove previous eventholder work-around to fix hover/click bug in IE 8 (test case by Ara Anjargolian); add support for setting the redraw overlay period and set it to 60 frames/s

API.txt

@@ -679,6 +679,10 @@ Customizing the grid
     mouseActiveRadius: number
   }
 
+  interaction: {
+    redrawOverlayInterval: number or -1
+  }
+
 The grid is the thing with the axes and a number of ticks. Many of the
 things in the grid are configured under the individual axes, but not
 all. "color" is the color of the grid itself whereas "backgroundColor"
@@ -798,6 +802,11 @@ If you want to disable interactivity for a specific data series, you
 can set "hoverable" and "clickable" to false in the options for that
 series, like this { data: [...], label: "Foo", clickable: false }.
 
+"redrawOverlayInterval" specifies the maximum time to delay a redraw
+of interactive things (this works as a rate limiting device). The
+default is capped to 60 frames per second. You can set it to -1 to
+disable the rate limiting.
+
 
 Specifying gradients
 ====================

jquery.flot.js

@@ -764,9 +764,8 @@
             ctx = canvas.getContext("2d");
             octx = overlay.getContext("2d");
 
-            // we include the canvas in the event holder too, because IE 7
-            // sometimes has trouble with the stacking order
-            eventHolder = $([overlay, canvas]);
+            // define which element we're listening for events on
+            eventHolder = $(overlay);
 
             if (reused) {
                 // run shutdown in the old plot object
@@ -2434,7 +2433,7 @@
 
         function triggerRedrawOverlay() {
             if (!redrawTimeout)
-                redrawTimeout = setTimeout(drawOverlay, 30);
+                redrawTimeout = setTimeout(drawOverlay, 1000/60);
         }
 
         function drawOverlay() {