magento/magento2:#19418 Cannot add additional field to Newsletter system configuration at desired position

- Adjusted Newsletter system configuration fields sortOrder so they has a step of 10

Author: Vasilii Burlacu

app/code/Magento/Newsletter/etc/adminhtml/system.xml

@@ -11,39 +11,39 @@
             <label>Newsletter</label>
             <tab>customer</tab>
             <resource>Magento_Newsletter::newsletter</resource>
-            <group id="subscription" translate="label" type="text" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1">
+            <group id="subscription" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                 <label>Subscription Options</label>
-                <field id="allow_guest_subscribe" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="allow_guest_subscribe" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Allow Guest Subscription</label>
                     <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                 </field>
-                <field id="confirm" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="confirm" translate="label" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Need to Confirm</label>
                     <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                 </field>
-                <field id="confirm_email_identity" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="confirm_email_identity" translate="label" type="select" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Confirmation Email Sender</label>
                     <source_model>Magento\Config\Model\Config\Source\Email\Identity</source_model>
                 </field>
-                <field id="confirm_email_template" translate="label comment" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="confirm_email_template" translate="label comment" type="select" sortOrder="40" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Confirmation Email Template</label>
                     <comment>Email template chosen based on theme fallback when "Default" option is selected.</comment>
                     <source_model>Magento\Config\Model\Config\Source\Email\Template</source_model>
                 </field>
-                <field id="success_email_identity" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="success_email_identity" translate="label" type="select" sortOrder="50" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Success Email Sender</label>
                     <source_model>Magento\Config\Model\Config\Source\Email\Identity</source_model>
                 </field>
-                <field id="success_email_template" translate="label comment" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="success_email_template" translate="label comment" type="select" sortOrder="60" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Success Email Template</label>
                     <comment>Email template chosen based on theme fallback when "Default" option is selected.</comment>
                     <source_model>Magento\Config\Model\Config\Source\Email\Template</source_model>
                 </field>
-                <field id="un_email_identity" translate="label" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="un_email_identity" translate="label" type="select" sortOrder="70" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Unsubscription Email Sender</label>
                     <source_model>Magento\Config\Model\Config\Source\Email\Identity</source_model>
                 </field>
-                <field id="un_email_template" translate="label comment" type="select" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
+                <field id="un_email_template" translate="label comment" type="select" sortOrder="80" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                     <label>Unsubscription Email Template</label>
                     <comment>Email template chosen based on theme fallback when "Default" option is selected.</comment>
                     <source_model>Magento\Config\Model\Config\Source\Email\Template</source_model>