Add option to disable it temporally when introducing passwds

[GoogleCodeExporter]

What steps will reproduce the problem?
1. $ sudo ls
2. you can see the password

Add a custom shortcut to temporally disable the key sniffing, useful when 
introducing passwords.

Original issue reported on code.google.com by fco....@gmail.com on 16 Sep 2011 at 4:23

[GoogleCodeExporter]

Thanks for requesting.

Currently, key-mon does not listen to keys for changing its function. Every 
change you need, you will need to operate on main window.

Personally, I don't like adding such feature (not the addition of hotkey 
listener). If you can remember to press the shortcut, then a couple of mouse 
click might not be too hard for user. (Although I personally like keys 
generally)

When I need to hide something keys, I drag the key-mon window off recording 
area. If I can't, I close it, then run it again.

If there is no objections I would apply patch happily, either it's an option in 
popup menu or a shortcut via key listener. The latter require much more 
efforts, which might need to go back and forth a few times since we don't have 
a listener for option change or sort of things.

Original comment by livibet...@gmail.com on 16 Sep 2011 at 4:48

[GoogleCodeExporter]

Thanks for coding such a nice tool, unfortunately I'm not a programmer, so I'd 
not be able to code the missing parts, I'll keep using it, and killing it when 
needed (I might be able to conf a shortcut for that). Hope someone else could 
see this report and add those features. Thanks again!

Original comment by fco....@gmail.com on 16 Sep 2011 at 5:57