[gtk-vnc] src: enable the alpha cursor encoding preferrentially

[Daniel P. Berrange <dberrange src gnome org>]

commit 806775546fa697b888bce35f6bbee17e17eaf7ae
Author: Daniel P. Berrangé <dan berrange com>
Date:   Tue Dec 8 14:19:07 2020 +0000

    src: enable the alpha cursor encoding preferrentially
    
    The alpha cursor provides better quality than the older x-cursor or
    rich cursor extensions.
    
    Signed-off-by: Daniel P. Berrangé <berrange redhat com>

 src/vncdisplay.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/vncdisplay.c b/src/vncdisplay.c
index 3995a03..1d14932 100644
--- a/src/vncdisplay.c
+++ b/src/vncdisplay.c
@@ -1618,6 +1618,7 @@ static void on_initialized(VncConnection *conn G_GNUC_UNUSED,
                             VNC_CONNECTION_ENCODING_DESKTOP_RESIZE,
                             VNC_CONNECTION_ENCODING_WMVi,
                             VNC_CONNECTION_ENCODING_AUDIO,
+                            VNC_CONNECTION_ENCODING_ALPHA_CURSOR,
                             VNC_CONNECTION_ENCODING_RICH_CURSOR,
                             VNC_CONNECTION_ENCODING_XCURSOR,
                             VNC_CONNECTION_ENCODING_POINTER_CHANGE,