Fix region, text and grid when updated - #922

c3.js

@@ -656,6 +656,9 @@
             $$.redrawLine(drawLine);
             $$.redrawArea(drawArea);
             $$.redrawCircle(cx, cy);
+            $$.redrawText(xForText, yForText, options.flow);
+            $$.redrawRegion();
+            $$.redrawGrid();
             if (config.onrendered) {
                 config.onrendered.call($$);
             }

src/core.js

@@ -651,6 +651,9 @@ c3_chart_internal_fn.redraw = function (options, transitions) {
         $$.redrawLine(drawLine);
         $$.redrawArea(drawArea);
         $$.redrawCircle(cx, cy);
+        $$.redrawText(xForText, yForText, options.flow);
+        $$.redrawRegion();
+        $$.redrawGrid();
         if (config.onrendered) {
             config.onrendered.call($$);
         }