`idlefolders` needs but does not set `autorefresh`

[madduck]

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The example config for idlefolders says:

In between synchronisations, Offlineimap can monitor mailboxes for new messages using the IDLE command. If you want to enable this, specify here the folders you wish to monitor. IMAP protocol requires a separate connection for each folder monitored in this way, so setting this option will force settings for:

• maxconnections: to be at least the number of folders you give
• holdconnectionopen: to be true
• keepalive: to be 29 minutes unless you specify otherwise
• singlethreadperfolder: to be true

The setting autorefresh is not mentioned, but under holdconnectionopen, it says:

This setting has no effect if autorefresh is not set.

… and indeed, idlefolders do not work unless autorefresh is explicitly set. I think this setting should be similarly forced like holdconnectionopen.