I'm making some sprites in the sprite editor for my project, but I've run into an annoying problem. I've drawn with smooth mode on, and when I fill in the middle there are transparent lines around the edge. This is of course because of the anti-aliasing. My question is, is there any way to flood fill a sprite with colour that won't create this effect? Failing that, I'd be happy to draw the object with smooth mode off, fill it, and then anti-alias the whole sprite, but I can't find an option for this.
Here's a picture to better explain my problem: