Prevent redrawing list of networks when visible

[Nick Rose]

When selecting a network to connect to from nm-applet's list, sometimes the list updates and redraws itself the split-second before clicking on a network. The often results in the order of networks changing, so that the wrong network is clicked on by mistake.

It would be helpful if the list was prevented from updating/redrawing when it is visible, so that this cannot happen.

An alternative solution would be to have the option to hide user-selected networks that will never be used from the list (e.g. ones that belong to neighbours etc.), so that they can never be clicked on by mistake in the future.