No marginal space validation added

Author: ajithkumar-maragathavel

app/code/Magento/Cms/view/adminhtml/ui_component/cms_block_listing.xml

@@ -146,6 +146,7 @@
                 <editor>
                     <validation>
                         <rule name="required-entry" xsi:type="boolean">true</rule>
+                        <rule name="no-marginal-whitespace" xsi:type="boolean">true</rule>
                     </validation>
                     <editorType>text</editorType>
                 </editor>