Restore original canvas context when destroying

diff --git a/src/Chart.Core.js b/src/Chart.Core.js
index 36a60841a984aa63c1bf6c9ed4a8c1b0d3e787f2..b71903e5188d0e534cc59920cf77d324195c7c0a 100755 (executable)
--- a/src/Chart.Core.js
+++ b/src/Chart.Core.js
@@ -868,6 +868,21 @@
                destroy : function(){
                        this.clear();
                        unbindEvents(this, this.events);
+                       var canvas = this.chart.canvas;
+
+                       // Reset canvas height/width attributes starts a fresh with the canvas context
+                       canvas.width = this.chart.width;
+                       canvas.height = this.chart.height;
+
+                       // < IE9 doesn't support removeProperty
+                       if (canvas.style.removeProperty) {
+                               canvas.style.removeProperty('width');
+                               canvas.style.removeProperty('height');
+                       } else {
+                               canvas.style.removeAttribute('width');
+                               canvas.style.removeAttribute('height');
+                       }
+
                        delete Chart.instances[this.id];
                },
                showTooltip : function(ChartElements, forceRedraw){