Issue #3154 - DataColumn checkForFilterErrors() now use Html::addCssClass

framework/grid/DataColumn.php

@@ -188,16 +188,13 @@ class DataColumn extends Column
      */
     public function checkForFilterErrors() 
     {
-        if ($this->filter !== false && $this->grid->filterModel instanceof Model &&
-                  $this->attribute !== null && $this->grid->filterModel->isAttributeActive($this->attribute) && 
-                  ArrayHelper::keyExists($this->attribute, $this->grid->filterModel->errors)) 
-        {
-            $filterClass = ArrayHelper::getValue($this->filterOptions, 'class', '');
-            if ($filterClass) 
-            { 
-                $filterClass .= ' ';
-            }
-            $this->filterOptions['class'] = $filterClass . 'has-error';
+        if ($this->filter !== false && 
+            $this->grid->filterModel instanceof Model &&
+            $this->attribute !== null && 
+            $this->grid->filterModel->isAttributeActive($this->attribute) && 
+            ArrayHelper::keyExists($this->attribute, $this->grid->filterModel->errors)
+        ) {
+            Html::addCssClass($this->filterOptions, 'has-error');
         }
     }