Unable to reproduce git master, seems to be fixed.

Many thanks Martin for the workaround !
I use this value now
l.595 cr.set_source_rgba(0.25, 0.25, 0.25, 1)
very cool 'next' and 'previous' also keeps the 'toggle document frame' enabled. This is good to review the storyboard sequence.

Thanks for working on frame , I abuse of them.

This grey mid alpha overlay is making me mad most of the time.
I would prefer for most artwork it to be 0% alpha, because it's not help me to see my painting strokes out of the canvas darkened. It's tricking my eyes and makes me do weird things about composition , values or tilted perspective.

Here I still would like to can setup the frame in the preferences to obtain frame variations like this depending on the project I work :
http://img824.imageshack.us/img824/5157/mypaintframe.jpg
I would imagine a part in the preferences like this :
http://img715.imageshack.us/img715/6150/20120112screenshot01.jpg

Next month I have to draw the storyboard for the Mango project in Amsterdam, and I want to abuse of Mypaint 'save as scrap' + a a desktop batch file renamer + 'next & previous' option to create a workflow about it ; having the cinema format for the filesize rounded to 64px is not a major problem ( even if it makes my full workflow rounded to 64px only for Mypaint ) , but having the display of strokes outside the canvas frame is really something annoying I would like to be fixed.

I'm also ok if you know the value in the code for turning it to 0% alpha as a workaround.

When painting oustide the 'document frame' ( activated ) in mirror mode, the compositing of the frame don't refresh, this cause the feeling to can 'paint' outside the frame.

ex :
http://img585.imageshack.us/img585/2185/20111207170050screensho.jpg

This is a minor bug, because affect only the display. A simple panning with the spacebar or a zoom refresh and refresh it.