Rollup merge of #150396 - GuillaumeGomez:fix-line-numbers-hidden, r=lolbinarycat [rustdoc] If line number setting is disabled, do not make line numbers take space While working on https://github.com/rust-lang/rust/pull/150395, I realized that when enabled then disabled the "show line numbers" setting, instead of looking like initially: <img width="904" height="148" alt="Screenshot From 2025-12-26 16-51-44" src="https://github.com/user-attachments/assets/a24df2f2-61be-4db5-b60f-519b35425fd2" /> The "space" taken by line numbers was still there: <img width="904" height="148" alt="Screenshot From 2025-12-26 16-51-41" src="https://github.com/user-attachments/assets/b44af75d-52a4-4401-98e4-602b16bf6b9b" /> This PR fixes it. First commit cleans up the `utils.goml` file a bit, I think I'll do more cleanup because switching the settings without reloading the page should make GUI tests a bit faster. r? `@yotamofek`
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