Rearrange has no Effect on in the Modell Gallery

Rearrange has no Effect on in the Modell Gallery if images have different resolutions,

the larger one is always preferred.

Rerrange is displayed in the edit of the post but in the gallery the sorting is completely ignored.

This is extremely annoying if you want to use your really good picture as a cover and then let the others follow, but this is not possible! I can currently only achieve this with a workaround by deleting everything else that ends up at the top despite the re-sorting.