[Users] [PATCH] IMAP OAUTH2

[Brian]

Running Slackware64 14.2(stable) with multilib.
Thank you to Kevin K for the link to developers mailing list with the
patch and development going on behind this enhancement request.
https://lists.claws-mail.org/pipermail/devel/2020-May/002489.html
The latest (May 28) patch was downloaded and applied to the
claws-mail.SlackBuild against latest 3.17.5 and everything built and
runs as expected.

Testing:
GMAIL - works as expected when generating and applying the gmail token
on OAUTH2 prefs page.
ZOHO - doesn't support OAUTH2, but does support Google Authenticator?
YAHOO - nothing but problems.  Currently use Plain Text and PLAIN
authorization and that has worked without problems for a couple of
years.  If I go to OAUTH2 prefs page, generate the token, and change
both Send(smtp) and Receive(imap) to OAUTH2 then it works, ONLY as long
as I stay in that account.  If I go to another yahoo IMAP account and
then come back to the OAUTH2 account the token no longer works and
claws-mail asks me to supply password, which fails until OAUTH2 is
disabled.  I also cannot send any message when OAUTH2 is enabled.
Actually all three of my yahoo accounts refuse to send until I back out
to 3.17.4 without OAUTH2 enabled. Summary worked for getting message
for one session, would not send  then nothing worked.

What is the proper instructions to setup yahoo imap and smtp mail?

Willing to continue to test.

Erik, Can you review attached claw-mail.SlackBuild script to see if
all the steps I've included are really needed?  Thanks.

Cheers, BrianA_MN
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