enthought/chaco — pull request #132 by mik854e (2013-07-11 19:42:49+00:00)
Title: Fix for Aspect Ratio Support in ZoomTool

Aspect ratio was not honored if mouse pointer moved away from the square selection corner. The removed line allowed any ROI to be selected outside of the region that was highlighted.

Now, the zoom is set to the highlighted region no matter where the mouse is unclicked.