vncviewer should support the UltraVNC ServerInput extension (disable input, blank monitor)

[astrand]

UltraVNC has an extension called "ServerInput", which disables the keyboard/mouse input of a remote machine, as well as blanks the monitor. This extension is also supported by the x11vnc server. From http://www.karlrunge.com/x11vnc/x11vnc_opts.html:

-noserverdpms The UltraVNC ServerInput extension is supported.
This allows the VNC viewer to click a button that will
cause the server (x11vnc) to try to disable keyboard
and mouse input at the physical display and put the
monitor in dpms powered off state. Use this option to
skip powering off the monitor.

It would be nice if the TigerVNC viewer could support this extension. The UltraVNC viewer does:

http://www.uvnc.com/docs/uvnc-viewer.html

There's a discussion in the gtk-vnc/vinagre project:

https://bugs.launchpad.net/ubuntu/+source/vinagre/+bug/1350973

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