I don't know, but I felt like sharing :)
The inpainting has definitely improved, a while ago it was impossible to get it to properly match the style of the rest of the image. You could always see where the original was altered. Now it blends much better with the rest of the image.
And inpainting of non-generated images is a recent thing, before that you could only alter images that Midjourney originally created.
Trollivier
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Nightmare VS Day dreaming
Prompt : A portrait split down the middle: the left side of the face is asleep and scared, with nightmarish shadows, terrifying imagery and eerie creatures in the background. The right side of the face is awake and calm, with colorful symbols of peace and creativity like floating flowers, soft clouds, and bright abstract shapes forming a dreamlike, idealistic scene. The two sides blend subtly in the center, showing harmony between fear and peace.