bug#64977: 29.1; `auth-source-macos-keychain-search' handles :user key incorrectly

[Eli Zaretskii]

> Date: Tue, 08 Aug 2023 17:20:32 -0500
> From: LdBeth <andpuke@foxmail.com>
> 
> Finally I get some time looking at this issue.
> 
> I think the bug is caused by `auth-source-macos-keychain-search-items'
> forget the fact that :users can be a list of string instead of a string.
> 
> The `auth-source-macos-keychain-search-items' also did
> not handle the protocol argument correctly. The `security' command
> needs the "-r" argument to be a string of 4 characters. This is also
> fixed in the patch attached.

Michael, any comments to the problem and the patch?