An outpaint whose new area still shows the plain fill color used to come
back as a finished-looking picture with bars. Stitch Inpaint now measures
how much of the new area is still flat at the fill color, beyond what the
source picture itself has, and when a quarter of it (or half of any
checked frame) is left, says so in the console and in a toast.
The check lives in its own helper, works for images and video and for any
fill color, and stays quiet on dark scenes that are painted.
ausboss
faf0462067