[gvfs] dav: Add comment for bug 594507

[Ross Lagerwall <rossl src gnome org>]

commit 7955e6333507b69a1d013c70376fb4b279df2556
Author: Ross Lagerwall <rosslagerwall gmail com>
Date:   Mon Aug 25 11:13:46 2014 +0100

    dav: Add comment for bug 594507
    
    https://bugzilla.gnome.org/show_bug.cgi?id=594507

 daemon/gvfsbackenddav.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/daemon/gvfsbackenddav.c b/daemon/gvfsbackenddav.c
index 8ecc319..4dd88ff 100644
--- a/daemon/gvfsbackenddav.c
+++ b/daemon/gvfsbackenddav.c
@@ -1741,6 +1741,8 @@ static void
 dns_sd_resolver_changed (GVfsDnsSdResolver *resolver,
                          GVfsBackendDav    *dav_backend)
 {
+  /* If anything has changed (e.g. address, port, txt-records or is-resolved),
+   * it is safest to just unmount. */
   g_vfs_backend_force_unmount (G_VFS_BACKEND (dav_backend));
 }
 #endif