While the original article [[ https://en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors | Eigenvalues and eigenvectors ]] for which this task was filed appears fixed, the same issue of unexpected horizontal scrolling is occurring on the [[ https://en.wikipedia.org/wiki/Aswan_Dam | Aswan Dam ]] article on Wikipedia v2.7.239-r-2018-07-31.
In this case it appears to be related to a wide image within the article.
=== Original task description ===
The [[ https://en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors | Eigenvalues and eigenvectors ]] seems to have a lot of horizontal space in it although no content is displayed //any where// in that space. This makes scrolling the article a little difficult as it seems to scroll to an empty space. The source of the space is not clear, probably due to a mathematical equation.
Possibly related to the change https://gerrit.wikimedia.org/r/#/c/351840/
The issue seems to be with the row "eigenvalues" in the "Applications" section.