Cannot add additional field to Newsletter system configuration at desired position

[vasilii-b]

Summary (*)

Environment: Magento 2.2-develop, Magento 2.3-develop
As a Magento developer, I want to add some additional settings to the Newsletter system configuration before Success Email Template (as example).

Examples (*)

Within a custom module, in the adminhtml/system.xml file, add a new field before Success Email Template, like following:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="newsletter">
            <tab>customer</tab>
            <group id="subscription">
                <field id="custom_field" translate="label comment" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Do some more stuff after subscription ?</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                </field>
            </group>
        </section>
    </system>
</config>

Actual results
With given above, the custom field will appear at the end of fields list in scope of Newsletter system configuration.

Expected result
Newly added field should be sorted according to given sortOrder value.

*The issue
The problem is that in the app/code/Magento/Newsletter/etc/adminhtml/system.xml group fields has sortOrder the same - 1.

Proposed solution

In the app/code/Magento/Newsletter/etc/adminhtml/system.xml group fields has sortOrder with a step of 10. So each additional field will get previous sortOrder value + 10.

[magento-engcom-team]

Hi @vasilii-b. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

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@vasilii-b do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @eduard13. Thank you for working on this issue.
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[magento-engcom-team]

@eduard13 Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-96671, MAGETWO-96672 were created