Insert Variable popup missing template variables for new templates

[roma84]

After the following PR #22469 was merged into 2.3-develop, you cannot anymore insert template variables in the newly created email templates.

Preconditions (*)

1. Magento 2.3-develop

Steps to reproduce (*)

1. Go to Marketing > Email Templates and press Add New Template button.
2. Select some template (e.g. Contact Form) and press Load Template button.
3. Press Insert Variable button.

Expected result (*)

1. You should be able to insert template variables:
   

Actual result (*)

1. Template variables section missing:
   

[m2-assistant]

Hi @roma84. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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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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@roma84 do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

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[m2-assistant]

Hi @stoleksiy. Thank you for working on this issue.
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[ghost]

✅ Confirmed by @stoleksiy
Thank you for verifying the issue! 👍 Your confirmation will help us to acknowledge and process this report.

[m2-assistant]

Hi @shikhamis11. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @engcom-backlog-nazar
Thank you for verifying the issue. Based on the provided information internal tickets MC-17239 were created

Issue Available: @engcom-backlog-nazar, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[roma84]

A possible solution for the issue:

1. Revert changes made in PR Fix #20111 - display variables in popup while editing existing email template #22469
2. Modify the following line instead:
   https://github.com/magento/magento2/blob/2.3-develop/app/code/Magento/Email/Block/Adminhtml/Template/Edit/Form.php#L194

--- a/app/code/Magento/Email/Block/Adminhtml/Template/Edit/Form.php
+++ b/app/code/Magento/Email/Block/Adminhtml/Template/Edit/Form.php
@@ -191,7 +191,7 @@ class Form extends \Magento\Backend\Block\Widget\Form\Generic
         }
         $template = $this->getEmailTemplate();
         if ($template->getId() && ($templateVariables = $template->getVariablesOptionArray(true))) {
-            $variables = array_merge_recursive($variables, $templateVariables);
+            $variables = array_merge_recursive($variables, [$templateVariables]);
         }
         return $variables;
     }

[shikhamis11]

@roma84 , your changes seems working . you can prepare a pull request with your changes
https://devdocs.magento.com/guides/v2.3/contributor-guide/contributing.html#pull_request

[m2-assistant]

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