Fix drawing stacked-100 problem

src/axis.js

@@ -376,39 +376,42 @@ c3_chart_internal_fn.tuneAxis = function(sync, callback){
 
     $$.pushCallback(callback);
 
-    if(!$$.config.stacked){
+    // if we don't need to tune
+    if($$.config.stacked){
+        $$.cachedRedraw();
+        return;
+    }
         
-        var apply = function(){
+    var apply = function(){
 
-            var minmax = $$.findMinMax();
+        var minmax = $$.findMinMax();
 
-            var sizesX;
-            if($$.config.is_xy){
-                sizesX = $$.getAbscissa($$.config.ed3Type, minmax.minX, minmax.maxX);
+        var sizesX;
+        if($$.config.is_xy){
+            sizesX = $$.getAbscissa($$.config.ed3Type, minmax.minX, minmax.maxX);
+        }
+        var sizesY = $$.getAxisData(minmax.minY, minmax.maxY);
+
+        $$.api.axis.range({
+            min: {
+                x: sizesX ? sizesX.min : undefined,
+                y: sizesY.min
+            },
+            max: {
+                x: sizesX ? sizesX.max : undefined,
+                y: sizesY.max
             }
-            var sizesY = $$.getAxisData(minmax.minY, minmax.maxY);
-
-            $$.api.axis.range({
-                min: {
-                    x: sizesX ? sizesX.min : undefined,
-                    y: sizesY.min
-                },
-                max: {
-                    x: sizesX ? sizesX.max : undefined,
-                    y: sizesY.max
-                }
-            });
+        });
 
-            $$.resolveCallbacks();
+        $$.resolveCallbacks();
 
-        };
+    };
 
-        if(sync){
-            apply();
-        } else {
-            $$.buffer.onlastfinish("tune-axis", apply);
-            $$.buffer.onlastfinish("cached-redraw", function(){});
-        }
+    if(sync){
+        apply();
+    } else {
+        $$.buffer.onlastfinish("tune-axis", apply);
+        $$.buffer.onlastfinish("cached-redraw", function(){});
     }
 
 };

src/callbacks.js

@@ -32,7 +32,7 @@ c3.chart.internal.fn.cachedRedraw = function(options, callback){
 
     $$.pushCallback(callback);
 
-    if($$.shouldCache){
+    if($$.config.shouldCache){
         if(!$$.buffer.has("tune-axis")){
             $$.buffer.onlastfinish("cached-redraw",
                 function(){

src/config.js

@@ -192,7 +192,9 @@ c3_chart_internal_fn.getDefaultConfig = function () {
         },
         tooltip_init_show: false,
         tooltip_init_x: 0,
-        tooltip_init_position: {top: '0px', left: '50px'}
+        tooltip_init_position: {top: '0px', left: '50px'},
+        // caching
+        shouldCache: true
     };
 
     Object.keys(this.additionalConfig).forEach(function (key) {