[cordite]

There should be a validation requirement that the first and last frames match the respective current and next slide.

There are a few in there that are disorienting because they jump. Most of those that do have jumping problems look like they are treating the source images as (or stretching to) squares.

[gren]

There is already! However it is not yet filtered in the current homepage but this will be ASAP.

as a proof: https://glsl.io/transition/a830822b23e846e25d2d

see that there is already some warnings ;-)