[vino] Properly remove watches when changing server props

[Ondrej Holy <oholy src gnome org>]

commit 56ac24642d60ef8398f3e44f571337e0224c6857
Author: Ondrej Holy <oholy redhat com>
Date:   Fri Aug 24 15:11:58 2018 +0200

    Properly remove watches when changing server props
    
    vino_server_init_io_channels calls vino_server_deinit_io_channels
    at the beginning, however the watches and channels don't have to be
    removed respective closed, because it relies on rfbListenSock array,
    which can be already modified as a consequence of changing server
    properties. Let's call vino_server_deinit_io_channels before changing
    server properties in order to prevent the following errors:
    
    rfbCheckFds: accept: Invalid argument
    
    https://bugzilla.gnome.org/show_bug.cgi?id=796349

 server/vino-server.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/server/vino-server.c b/server/vino-server.c
index b8cd755..7e5599b 100644
--- a/server/vino-server.c
+++ b/server/vino-server.c
@@ -963,8 +963,6 @@ vino_server_init_io_channels(VinoServer *server)
   rfbScreenInfoPtr rfb_screen = server->priv->rfb_screen;
   int              i;
 
-  vino_server_deinit_io_channels (server);
-
   dprintf (RFB, "Creating watch for listening socket [ ");
   for (i=0; i < rfb_screen->rfbListenSockTotal; i++)
     {
@@ -1085,6 +1083,7 @@ vino_server_init_from_screen (VinoServer *server,
 
   vino_server_update_security_types (server);
 
+  vino_server_deinit_io_channels (server);
   vino_server_init_io_channels (server);
 
   vino_mdns_add_service ("_rfb._tcp", rfb_screen->rfbPort);
@@ -1624,7 +1623,12 @@ vino_server_set_network_interface (VinoServer *server,
     server->priv->network_interface = NULL;
 
   if (server->priv->rfb_screen != NULL)
-    rfbSetNetworkInterface (server->priv->rfb_screen, server->priv->network_interface);
+    {
+      vino_server_deinit_io_channels (server);
+      rfbSetNetworkInterface (server->priv->rfb_screen, server->priv->network_interface);
+      vino_server_init_io_channels (server);
+      vino_server_control_upnp (server);
+    }
 
   g_object_notify (G_OBJECT (server), "network-interface");
 }
@@ -1651,6 +1655,8 @@ vino_server_set_use_alternative_port (VinoServer *server,
 
       if (server->priv->rfb_screen)
         {
+          vino_server_deinit_io_channels (server);
+
           if (server->priv->use_alternative_port)
             rfbSetPort (server->priv->rfb_screen,
                         server->priv->alternative_port);
@@ -1688,6 +1694,7 @@ vino_server_set_alternative_port (VinoServer *server,
       if (server->priv->rfb_screen &&
           server->priv->use_alternative_port)
        {
+          vino_server_deinit_io_channels (server);
          rfbSetPort (server->priv->rfb_screen, server->priv->alternative_port);
          vino_server_init_io_channels (server);
          vino_server_control_upnp (server);