- Proper alpha blending when merging layers in overlay mode to avoid black edges
- Also use alpha blending in OverlayHandler with text to, again, avoid black edges
- Use premultiplied alpha when bilinear sampling to, you guessed it, avoid black edges
- When adding layers to projection, add them to the top. Shockingly, this has nothing to do with black edges.
- Fix incorrect progress bar displaying progress in projection layers UI