Move gesture while in erase mode erases

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Draw something nice 
2. Click on the eraser 
3. Use dual touch to move the canvas, accidentally moving over your drawing ;)

What is the expected output? What do you see instead?
The Canvas should pan. 
The eraser still does its job, causing unwanted deletion of lines . 

What version of the product are you using? On what operating system?
Quill 7.2 
Android HC 3 .1 
ThinkPad tablet 

Please provide any additional information below.
just wanted to thank you for a fantastic app! Quill alone is reason enough to 
buy a tablet :)

Original issue reported on code.google.com by [email protected] on 2 Dec 2011 at 1:59