About the "undo" function on the scratchpad

Hello,

Typically if you click the undo button on the scratchpad it will undo the last thing you drew. But recently I've noticed that when I click this icon it will erase the entire board. Now this is helpful once in a while when you need to clear the board and start over, but when I'm writing down, say fractions and my mouse skews because I moved it over something and the line I'm drawing between the two numbers goes everywhere, my default is to hit the back button. This obviously doesn't go well.

The clear all function is OK but the undo one is much more useful, please either fix the undo if it's broken or return the old function to the undo button and get a new one for the clear all

Thanks

-Zayber