08324ba2c1
When no image user is known the last used frame of the image is used to read a frame. When partial updating an image there is always an image user that would use a zerod out image user, meaning the frame number is set to 0 when using the clone tool. This fix syncs the frame with the last used frame of the image to ensure that the buffer exists. There is a bailout in the overlay_edit_uv.c.