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[Marty Vona <vona@xxxxxxx>]

Ok I just installed 8.1.0 beta.  This bug is effectively worked around
by the new vm-imap-sync-on-get option, which calls vm-imap-synchronize-
buffer when getting new mail.

Technically, vm-save-buffer in 8.1.0 still exhibits the perhaps less-
than-desirable behavior of failing to sync an imap buffer if it is not
locally modified.  But I am perfectly willing (in fact, I prefer) to hit
"g" instead of "S".

Additionally, there is a new interactive cover vm-imap-synchronize of
vm-imap-synchronize-buffer.

Marty

-- 
vm-save-folder should always synchronize an imap folder, even if local buffer is not modified
https://bugs.launchpad.net/bugs/498321
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Status in VM (View Mail) for Emacs: Incomplete

Bug description:
Currently (vm 8.0.14) vm-save-folder appears to actually do a vm-imap-synchronize-folder if the folder is in fact accessed via imap.  This is good, since another mail client could have changed the folder on the imap server (e.g. deleted some messages), and this gives a mechanism for vm to update its view of the folder to reflect the server changes.

The issue is that vm-save-folder shortcuts and will not vm-imap-synchronize-folder if the buffer containing the folder is not currently modified (buffer-modified-p).  But it is entirely possible for the buffer to be unmodified but still out of sync due to changes only on the server.

vm-imap-synchronize-folder is not written as an interactive function so the best way I understand how to trigger it is via vm-save-folder.

As a workaround, I disabled the buffer-modified-p check in vm-save, and it seems to be working, though this is probably not the ideal fix.