Rollup merge of #99779 - GuillaumeGomez:fix-item-info-pos-and-height, r=notriddle

Rollup merge of #99779 - GuillaumeGomez:fix-item-info-pos-and-height, r=notriddle

Fix item info pos and height

Fixes https://github.com/rust-lang/rust/issues/98266.
Fixes https://github.com/rust-lang/rust/issues/98343.

You can test it [here](https://rustdoc.crud.net/imperio/fix-item-info-pos-and-height/lib2/trait.Trait.html).

Here is a screenshot of the result:

![Screenshot from 2022-07-26 21-55-53](https://user-images.githubusercontent.com/3050060/181100624-18b8b045-5c25-4c7c-9c44-97d55d29b675.png)

r? `@jsha`