Map the "Lens/Search" key to switch scaling mode.

```
What steps will reproduce the problem?
1. Pressing the lens/search key does nothing.

What is the expected output? What do you see instead?
Could be used to change the scaling mode.

What version of the product are you using? On what operating system?
090131 to connect to Fedora 9 machine.

Please provide any additional information below.

```

Original issue reported on code.google.com by `nospamno...@gmail.com` on 1 Feb 2009 at 9:23