Pull Requests and issues have broken layout on the mobile website

[Noratrieb]

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Bug

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As of ~a week ago, Pull Requests and Issues have broken layout in many different places on the mobile website.

Additionally, the diff view settings have been changed to split by default, which is completely unusable on mobile (but changing it to unified works).

Firefox and Chrome both show the same behavior.

Example on rust-lang/rust#152352:

A much worse example on rust-lang/rust#148190

and in the code diff tab of that PR:

The issue overview: https://github.com/rust-lang/rust/issues<

Also, the organization button hidden in the breacrumbs does not work. It visually appears to register the press, but nothing happens.

All of this appears to have regressed at the same time, I do not remember only parts of this being broken.

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[KerimDemirkaynak]

The problem hasn't been fixed for a month.

[1Code-JS]

Needless/unused padding

Chrome

Firefox

Both screenshots were taken whilst logged out. It's like releasing a new but still WIP pull request conversation page UI to the public too early, without the "preview" or "beta" tag. It should have been hidden behind a feature preview toggle, with a link to the (yet to be created) discussion for feedback.

[1Code-JS]

Is there's any real reason to reduce viewing area when scrolling down these pages by displaying full PR names wrapped to 5 lines (for this example PR) in portrait mode on my screen?

Conversation page

Commit list page