MAGETWO-42365: "Export" Admin page lost its styles

Author: Dubovyk Oleksandr

app/code/Magento/Backend/Block/Widget/Grid/Column/Renderer/Checkbox.php

@@ -108,15 +108,18 @@ public function render(\Magento\Framework\DataObject $row)
      */
     protected function _getCheckboxHtml($value, $checked)
     {
-        $html = '<input type="checkbox" ';
+        $html = '<label class="data-grid-checkbox-cell-inner" ';
+        $html .= ' for="id_' . $this->escapeHtml($value) . '">';
+        $html .= '<input type="checkbox" ';
         $html .= 'name="' . $this->getColumn()->getFieldName() . '" ';
         $html .= 'value="' . $this->escapeHtml($value) . '" ';
+        $html .= 'id="id_' . $this->escapeHtml($value) . '" ';
         $html .= 'class="' .
             ($this->getColumn()->getInlineCss() ? $this->getColumn()->getInlineCss() : 'checkbox') .
-            ' admin__control-checkbox' .
-            '"';
+            ' admin__control-checkbox' . '"';
         $html .= $checked . $this->getDisabled() . '/>';
-        $html .= '<label></label>';
+        $html .= '<label for="id_' . $this->escapeHtml($value) . '"></label>';
+        $html .= '</label>';
         /* ToDo UI: add class="admin__field-label" after some refactoring _fields.less */
         return $html;
     }