[Bug 22872] New: PuTTY Pageant authentication agent does not provide cached keys

http://bugs.winehq.org/show_bug.cgi?id=22872

Summary: PuTTY Pageant authentication agent does not provide
                    cached keys
           Product: Wine
           Version: 1.1.44
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

The pageant program for PuTTY does not provide stored keys to other
applications, such as plink.

To duplicate:

wine pageant yourkey.ppk
wine plink -s -v -l yourname yourserver

Looking up host "10.0.0.212"
Connecting to 10.0.0.212 port 22
Server version: SSH-2.0-OpenSSH_4.7
We claim version: SSH-2.0-PuTTY_Release_0.60
Using SSH protocol version 2
Doing Diffie-Hellman group exchange
Doing Diffie-Hellman key exchange with hash SHA-256
Host key fingerprint is:
ssh-rsa 2048 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
Initialised AES-256 SDCTR client->server encryption
Initialised HMAC-SHA1 client->server MAC algorithm
Initialised AES-256 SDCTR server->client encryption
Initialised HMAC-SHA1 server->client MAC algorithm
Pageant is running. Requesting keys.

If it was working, here it would say:
Pageant has 1 SSH-2 keys
Trying Pageant key #0

but instead we get a password prompt, as if pageant has no cached keys:
Using username "john.voltz".
john.voltz@10.0.0.212's password: