Bugfix #33989

Transparent region drawing and blend broke by commit 53919 5 days ago.
This commit reverts the change.

The claim in previous commit "edited code for readability" is quite
disputable :) The error is hard to notice even.

I also like to emphasize that people should check with owners for code
before committing changes! Cleaning code is first a job for maintainers.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54098 954f8c5b-7b00-dc11-b283-0030488c597c