Swift Mailer not rendering HTML & Theme

Thank you for looking into this Jacob, here is my export.

uuid: 029534db-1fbc-49b0-a6e3-f7ce5101e3fa
langcode: en
status: open
dependencies: {  }
open: null
close: null
weight: 0
uid: 12
template: false
archive: false
id: swift_mailer_email_test
title: 'Swift Mailer Email Test'
description: ''
category: ''
elements: |
  testing:
    '#type': textarea
    '#title': testing
css: ''
javascript: ''
settings:
  ajax: false
  ajax_scroll_top: form
  page: true
  page_submit_path: ''
  page_confirm_path: ''
  form_submit_once: false
  form_exception_message: ''
  form_open_message: ''
  form_close_message: ''
  form_previous_submissions: true
  form_confidential: false
  form_confidential_message: ''
  form_convert_anonymous: false
  form_prepopulate: false
  form_prepopulate_source_entity: false
  form_prepopulate_source_entity_required: false
  form_prepopulate_source_entity_type: ''
  form_reset: false
  form_disable_autocomplete: false
  form_novalidate: false
  form_disable_inline_errors: false
  form_required: false
  form_unsaved: false
  form_disable_back: false
  form_submit_back: false
  form_autofocus: false
  form_details_toggle: false
  form_access_denied: default
  form_access_denied_title: ''
  form_access_denied_message: ''
  form_access_denied_attributes: {  }
  form_file_limit: ''
  submission_label: ''
  submission_log: false
  submission_views: {  }
  submission_views_replace: {  }
  submission_user_columns: {  }
  submission_user_duplicate: false
  submission_access_denied: default
  submission_access_denied_title: ''
  submission_access_denied_message: ''
  submission_access_denied_attributes: {  }
  submission_exception_message: ''
  submission_locked_message: ''
  previous_submission_message: ''
  previous_submissions_message: ''
  autofill: false
  autofill_message: ''
  autofill_excluded_elements: {  }
  wizard_progress_bar: true
  wizard_progress_pages: false
  wizard_progress_percentage: false
  wizard_progress_link: false
  wizard_start_label: ''
  wizard_preview_link: false
  wizard_confirmation: true
  wizard_confirmation_label: ''
  wizard_track: ''
  preview: 0
  preview_label: ''
  preview_title: ''
  preview_message: ''
  preview_attributes: {  }
  preview_excluded_elements: {  }
  preview_exclude_empty: true
  preview_exclude_empty_checkbox: false
  draft: none
  draft_multiple: false
  draft_auto_save: false
  draft_saved_message: ''
  draft_loaded_message: ''
  confirmation_type: page
  confirmation_title: ''
  confirmation_message: ''
  confirmation_url: ''
  confirmation_attributes: {  }
  confirmation_back: true
  confirmation_back_label: ''
  confirmation_back_attributes: {  }
  confirmation_exclude_query: false
  confirmation_exclude_token: false
  limit_total: null
  limit_total_interval: null
  limit_total_message: ''
  limit_user: null
  limit_user_interval: null
  limit_user_message: ''
  entity_limit_total: null
  entity_limit_total_interval: null
  entity_limit_user: null
  entity_limit_user_interval: null
  purge: none
  purge_days: null
  results_disabled: false
  results_disabled_ignore: false
  token_update: false
access:
  create:
    roles:
      - anonymous
      - authenticated
    users: {  }
    permissions: {  }
  view_any:
    roles: {  }
    users: {  }
    permissions: {  }
  update_any:
    roles: {  }
    users: {  }
    permissions: {  }
  delete_any:
    roles: {  }
    users: {  }
    permissions: {  }
  purge_any:
    roles: {  }
    users: {  }
    permissions: {  }
  view_own:
    roles: {  }
    users: {  }
    permissions: {  }
  update_own:
    roles: {  }
    users: {  }
    permissions: {  }
  delete_own:
    roles: {  }
    users: {  }
    permissions: {  }
  administer:
    roles: {  }
    users: {  }
    permissions: {  }
  test:
    roles: {  }
    users: {  }
    permissions: {  }
handlers:
  email:
    id: email
    label: Email
    handler_id: email
    status: true
    conditions: {  }
    weight: 0
    settings:
      states:
        - completed
      to_mail: something@something.com
      to_options: {  }
      cc_mail: ''
      cc_options: {  }
      bcc_mail: ''
      bcc_options: {  }
      from_mail: _default
      from_options: {  }
      from_name: _default
      subject: _default
      body: |
        <div style="font-family:Helvetica;font-size:16px;">
        <p>Hello World</p>
        </div>
      excluded_elements:
        testing: testing
      ignore_access: false
      exclude_empty: true
      exclude_empty_checkbox: false
      html: true
      attachments: false
      twig: false
      debug: false
      reply_to: ''
      return_path: ''
      sender_mail: ''
      sender_name: ''
      theme_name: ''

I also tried changing the theme_name value from default to my theme name, but still same result.

Also, I have added images & text to my /theme/THEMENAME/templates/swiftmailer.html.twig and I see none of that. Looks to me that swiftmailer.html.twig is not getting called by webform.

I have downloaded the latest dev, placed the patch file in /webform root folder.

When I try git apply -v 3005843-6.patch

I get

Skipped patch 'src/Plugin/WebformHandler/EmailWebformHandler.php'.

and then checked EmailWebformHandler.php and patch has not been applied.

I guess I'll manually apply it and then generate a new patch if it works.

Thanks, these changes fixed the issue.

I have re-rolled the patch and tested it and it applies cleanly.