Quote string overridden in nonflowed reply to flowed text

[Adam H. Kerman]

I'm using the Prefer Plain Text and Do Not Send Flowed Text features.
The quoting level indicator string is ">" without interstitial whitespace.
Quote Replace String (quote string substitution for viewing, not
composing) has No Value Set.

One of my correspondents sends email as HTML with a plain text
alternative part attachment in flowed text.

If I read the plain text part, I don't see "> ", although I do see it if
I expose headers and look at the unrendered message. Why is it
overriding the unset Quote Replace String?

Weird things happen in reply to his messages.

Replying to the plain text part, the quote string for his text is "> ".
Why is it overriding my choice of quote string given the setting of
Do Not Send Flowed Text?

When he sends me a reply to my message, in the HTML part, he isn't using
a quote level indicator for my quoted text, which means my reply shows
his quote of my text and his reply text at the same quote level. Looking
at the HTML, he's using a blockquote tags to indicate text quoted from
my precursor message to his reply.

I manually fix the quote level in reply. I suppose there's nothing for
alpine to recognize here.

[D]

Not a solution but just my experience. I see a lot of different quoting
styles and characters. Sometimes it works and other times it is very
difficult to tell who wrote what.

I suspect that it is the users client which garbles everything. Especially
if the user is using webmail, google, microsoft and so on, since
especially microsoft seems to never follow any standards. =(

Best regards,
Daniel