Two cases kept the old picture on screen after a move or resize:
- A page that had no tiles when the edit applied was taken as drawn
again as soon as a first tile arrived, while its backdrop still had
the picture. Out of date now means its whole-page raster or any tile
still waits for a replacement.
- A second drag before the page was drawn again took the picture's
pixels from its new frame, where the raster doesn't have it, and
blanked only that. It now takes them from where the raster still has
the picture and blanks that, and keeps it as the source on release.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
