Emoji's in the subject with RFC 2047 encoding are not handled well

[noloader]

Hi Everyone. Thanks for the tool. I've been looking for a tool to convert emails to pdfs for a while.

I noticed emoji's in the subject are not handled well. Encoding of subjects is covered in RFC2047:

encoded-word = "=?" charset "?" encoding "?" encoded-text "?="

Here's an example from GMail:

When I "view Original" in GMail and then "Download Original" message, the subject is encoded per RFC 2047 as:

=?utf-8?q?=F0=9F=92=8B_Unlock_Your_Perfect_Valentine=27s_Date_Today_=F0=9F=92=9D?=

Then, after conversion using email-to-pdf-converter, I see:

Notice the emojis have disappeared for the subject in the pdf. Emoji's in the body are also missing, but I am less concerned about that.

Attached is the original message, screen captures, and a converted email to pdf: test-subject-with-emojis.zip.

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Here is the command I used to perform the conversion. emailconverter-3.0.0-all.jar was downloaded from this GitHub.

$ java -jar emailconverter-3.0.0-all.jar test-subject-with-emojis.eml

which results in:

$ java -jar emailconverter-3.0.0-all.jar test-subject-with-emojis.eml 
Start converting test-subject-with-emojis.eml to test-subject-with-emojis.pdf
Mime Structure of test-subject-with-emojis.eml:
-----------Mime Message-----------
> multipart/mixed
> |  text/html
----------------------------------
Extract the inline images
Start conversion to pdf
The switch --viewport-size, is not support using unpatched qt, and will be ignored.The switch --image-quality, is not support using unpatched qt, and will be ignored.Loading page (1/2)
Printing pages (2/2)                                               
Done                                                           
Conversion finished

And if needed:

$ lsb_release -a
Distributor ID: Ubuntu
Description:    Ubuntu 22.04.5 LTS
Release:        22.04
Codename:       jammy

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Libre Office has a similar bug at https://bugs.documentfoundation.org/show_bug.cgi?id=129523. In the past I tried to convert emails to pdf using Libre Office tools.

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And to be clear, these types of messages are spam. My need to convert them to pdf is due to a hobby of mine. I like to cause problems for spammers and their service providers. I've dragged them into court in the past. Moving forward, I would like to ensure the lawyers and judge see the annoying emojis.

(It is more like return the favor to spammers and service providers, considering how much time and effort I waste on sifting through their crap while trying to maintain free software projects and their websites).