Decode URIs for text/plain link references comparison
I start typing a new email and paste in it https://www.example.org/#änderung
.
Evolution generates text/plain part and sends this email:
UU https://www.example.org/#änderung [1] UU
[1] https://www.example.org/#änderung https://www.example.org/#%C3%A4nderung
Since both URLs https://www.example.org/#änderung and https://www.example.org/#%C3%A4nderung are practically identical, Evolution shall not create a [1] reference for this URL, but just spell https://www.example.org/#änderung once.