Ihor Radchenko <yantar92@posteo.net> writes:

> "Christopher M. Miles" <numbchild@gmail.com> writes:
>
>> Whether can this patch be merged at first, put the test in future to
>> finish? In recent days, I still have not figured out this image overlays
>> test.
>
> Sure. Can you please send the final version of the patch and the working
> tests?

I separated code patch and test into two patches. You can apply selectively.