Notification force formatting settings

[alfureu]

Describe the bug
Some of us have email clients where we have only 2 options to display the message body: text or HTML. This is particularly the case with the popular emClient email client. The issue is that with changedetection's email notification the message body is rearranged as non-structured text in both notification as text only or HTML.

Unfortunately the email client does not allow any formatting of the email whatsoever, making the tracking of changes impossible in the client.

With the general notification settings:

{{watch_title}} had a change...
{{watch_url}}

---

{{diff_added}}

one would expect to get the following email notification:

https://changedetection.io/CHANGELOG.txt
had a change...

---

(added ) HEAD / 2023-06-28 00:03:02 +0200:
(added ) - Fix - Watches werent falling back to global default formats correctly when required (#1656)

(added ) 0.43.1 / 2023-06-27 18:28:18 +0200:
(added ) - 0.43.1
(added ) - Bug fix - Notification settings were not cascading from global -> tags -> watch correctly in some cases (#1654)
(added ) - Bug - Fix watch clone (#1647)
(added ) - UI - Dont allow empty tag names (#1641)

but instead the email looks like this:

https://changedetection.io/CHANGELOG.txt had a change... ____________________________________________ (added ) HEAD / 2023-06-28 00:03:02 +0200: -(added ) Fix - Watches werent falling back to global default formats correctly when required (#1656) (added ) 0.43.1 / 2023-06-27 18:28:18 +0200: - 0.43.1 (added ) - Bug fix - Notification settings were not cascading from global -> tags -> watch correctly in some cases (#1654) (added ) - Bug - Fix watch clone (#1647) (added ) - UI - Dont allow empty tag names (#1641)

You can easily see that without any formatting it is extremely difficult to see the changes, additions...

Version
v0.43.1

To Reproduce

Steps to reproduce the behavior:

1. Set any Text or HTML notification in changedetection
2. have the wrong email client

Expected behavior
Would it be please possible to introduce some formatting elements into the notifications? For example, I would really appreciate if the same formatting would show up (with forced left indentation and forced CR LFs) as under the Diff button in changedetection's web frontend.

[Arathen]

Just to add, this seems to be something which was introduced only with 0.43.1 this week. Prior to this version a diff rendered correctly, while after it does not. Im using Protonmail via a browser, and that has the same issue.

Before:

After:

Diffs from different watches obviously. Both are Github tag pages, albeit different apps.

Thanks.

[dgtlmoon]

Agreed- there is some issue, looking into it

[dgtlmoon]

kinda weird thing, when I select HTML I get the two versions (which is correct) but the HTML one has no <br> etc

--===============4993939228724319407==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

fallback-body http://localhost:5005/test-endpoint had a change. --- (change=
d) Which is across multiple lines (into) which has this one new line ---
--===============4993939228724319407==
Content-Type: text/html; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

fallback-body http://localhost:5005/test-endpoint had a change.
---
(changed) Which is across multiple lines
(into) which has this one new line
---