Improve window title when connected to newer spice-server

Recent spice servers send the guest vm name and uuid to the client.  We can use
these values to display the proper vm name in the window title if a title is not
specified on the commandline. We can also be smarter about the title in
virt-viewer as well.

If a title is specified on the comamndline (-t/--title=foo), we use that.  If not,
we fall back to the vm name.  If that is empty, we fall back to the uri of the
connection.

Comparison between old behavior and new behavior

Using new spice-server
Command                                     Old title                   New title
-------                                     ---------                   ---------
remote-viewer -t xyz spice://host:port      xyz                         xyz
remote-viewer spice://host:port             spice://host:port           <vmname>
virt-viewer <vmname>                        <vmname>                    <vmname>
virt-viewer <uuid>                          <uuid>                      <vmname>

Using old spice-server
Command                                     Old title                   New title
-------                                     ---------                   ---------
remote-viewer -t xyz spice://host:port      xyz                         xyz
remote-viewer spice://host:port             spice://host:port           spice://host:port
virt-viewer <vmname>                        <vmname>                    <vmname>
virt-viewer <uuid>                          <uuid>                      <vmname>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/virt-viewer-file.c b/src/virt-viewer-file.c
index 639d96e..09f76b3 100644
--- a/src/virt-viewer-file.c
+++ b/src/virt-viewer-file.c
@@ -632,7 +632,7 @@ virt_viewer_file_fill_app(VirtViewerFile* self, VirtViewerApp *app, GError **err
     }
 
     if (virt_viewer_file_is_set(self, "title"))
-        virt_viewer_app_set_title(app, virt_viewer_file_get_title(self));
+        g_object_set(app, "title", virt_viewer_file_get_title(self), NULL);
 
 
     virt_viewer_app_clear_hotkeys(app);