Please describe the problem:
If you enable the feature in mouse preferences to highlight the mouse cursor by hitting the control key, you can no longer send the control key to vncviewer sessions. It doesn't matter which version of vncviewer. I tried realvnc, tightvnc, and vnc4. 

Steps to reproduce:
1. turn on mouse highlight with control in the mouse preferences of control-center
2. load vncviewer and log into a VNC server somewhere
3. type Ctrl-A, and the VNC server will only get "A" instead of "Ctrl-A"
4. type Ctrl-P, and the VNC server will only get "P" instead of "Ctrl-P"


Actual results:
The CTRL keypress is trapped by the GNOME mouse handler and is NOT passed to the vncclient. 

Expected results:
I would expect the control character to be passed to vncviewer so it could be sent to the remote.

Does this happen every time?
Yes.

Other information: