Failing test: Attachment name decoding

[nuernbergerA]

Added a failing test for attachment filename decoding issue.

As always its related to umlauts.

---

#410

[Webklex]

Hi @nuernbergerA ,
many thanks for your pr! The failed test message is indeed strange:

There was 1 failure:

1) Tests\issues\Issue410Test::testIssueEmailB
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-'2021_Mängelliste_0819306.xlsx'
+'2021_Mängelliste_0819306.xlsx'

/home/runner/work/php-imap/php-imap/tests/issues/Issue410Test.php:47

I currently can't make sense of it - I'll have to play around with it and think about it :)

Best regards & thanks again,

[nuernbergerA]

Hey @Webklex

the output from github actions is normalized
expected is an "ä"
actual is "a"+" ̈"

see https://unicode.org/charts/nameslist/n_0300.html (COMBINING DIAERESIS)

[Webklex]

Hi @nuernbergerA ,
many thanks for the followup. It's the first time I came across the topic of COMBINING DIAERESIS - always something new. I believe I found the culprit, but lets see my next commit fixes it or not :)

Thanks again,