Modifying a file/folder in the shared folder isn't seen without a refresh in the guest. It would be great to add a filesystem "notify". Although there has been several attempt to add it to the webdav RFC, there is still no standard for that.
Some webdav discussions:
For Spice, we could use an out of band protocol addition.
Once libsoup has webdav support, it would be fun and relatively easy to create a custom channel for subscribing to changes on a folder/collection (that's essentially how smb does, so I guess that's enough for a filesystem protocol)
It's essentially just a phodav & gvfs implementation then.
Eventually, it might be a good idea to write an IETF RFC about this.
(In reply to Marc-Andre Lureau from comment #2)
> Once libsoup has webdav support, it would be fun and relatively easy to
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