This may be related to T127079: Ugly unexpected <pre> in Notifications

Change 273284 had a related patch set uploaded (by Sbisson):
Force notification body on a single line

https://gerrit.wikimedia.org/r/273284

The spec here says:

We want to avoid wikitext. A plain text of the rendered content seems good as an overview.

One thing that means is that if message we're excerpting contains a link, that link should be just plain text (i.e., not a link) in the excerpt. This issue came up in T127249. I'm just noting it down here so we can be sure to test it when this ticket is ready for Q&A.

Change 273284 merged by jenkins-bot:
Force notification body on a single line

https://gerrit.wikimedia.org/r/273284

Checked in betalabs.

1. All newlines and white spaces seems to be handled correctly - they are removed and the text excerpt in Notification panel is displayed without them.

2. The following examples refer to the cases where Reply text consists entirely of the samples. If Reply includes the samples and the text - the correct text excerpt is present.

There are empty text excerpts for the following cases - if the text starts with the samples:

[[Category:Test]]
[[Category:1687 deaths]]
[[Category:Earth]]
__INDEX__
__FORCETOC__

or

<!-- TEST N.1 -->

[[File:Industrial robot.jpg|thumb]]
[[File:Double-O-Arch Arches National Park 2.jpg|thumb]]

3. The text from links will be displayed as

Mavetuna44 Mavetuna22

[[Mavetuna44|Mavetuna44]]
[[Mavetuna22|Mavetuna22]]

4. Tables text content will be displayed as

Header1 Header2 Header3

{| class="wikitable"
! rowspan="2" colspan="2" |Header 1
!Header 3
!Header 4
|-
| rowspan="2" colspan="2" |
|-
|
| rowspan="2" |
|-
|
|
|
|}

5. Templates

{{Infobox person|name = elitre}}
{{Infobox person|name = krinkle dev}}

will be displayed as:
elitre krinkle dev

Note: Let me know if some other cases should be tested.

Checking the cases for tags - from T120291: wikitext in flow titles is parsed (HTML tags like <tt> and templates) on echo notifications - seems quite safe.