Improvement: HTML formatting not kept when forwarding an email

When forwarding an email containing links, for example: some words, the html formatting is not kept and message is transformed in plain text, loosing the URL.

Expected behavior

I would like to keep the html formatting with links (or at least keep the URL?)

Actual behavior

Original message is transformed in plain text leading to: "some words" but no URL.

Steps to reproduce

1. Send an html formatted email using Thunderbird, for example. Email containing a link like some words
2. Using K9mail on a smartphone, go to the "Sent" folder
3. Select the sent mail and forward it. Here, the mail editor is in plain text, URL lost.

Environment

K-9 Mail version: mine is 5.403 but I think issue is present in all versions
Android version: 7.0 on Archos Sense 55S
Account type (IMAP, POP3, WebDAV/Exchange): IMAP account

Thanks

Reproduce the problem by forwarding an HTML email from the Sent folder on K-9 Mail, using a link such as the one in the report. Trace the forwarding and message-editor path to find where HTML becomes plain text; done means forwarded links retain their formatting or at least their URLs.