Overload new source page sidebar button position

Author: GuillaumeGomez

src/utils/rustc_version.rs

@@ -44,8 +44,11 @@ pub(crate) fn parse_rustc_date<S: AsRef<str>>(version: S) -> Result<NaiveDate> {
 /// generate this version of this crate.
 pub fn get_correct_docsrs_style_file(version: &str) -> Result<String> {
     let date = parse_rustc_date(version)?;
+    // This is the date where https://github.com/rust-lang/rust/pull/144476 was merged.
+    if NaiveDate::from_ymd_opt(2025, 8, 20).unwrap() < date {
+        Ok("rustdoc-2025-08-20.css".to_owned())
     // This is the date where https://github.com/rust-lang/rust/pull/91356 was merged.
-    if NaiveDate::from_ymd_opt(2021, 12, 5).unwrap() < date {
+    } else if NaiveDate::from_ymd_opt(2021, 12, 5).unwrap() < date {
         // If this is the new rustdoc layout, we need the newer docs.rs CSS file.
         Ok("rustdoc-2021-12-05.css".to_owned())
     } else {

src/web/statics.rs

@@ -16,6 +16,8 @@ const STYLE_CSS: &str = include_str!(concat!(env!("OUT_DIR"), "/style.css"));
 const RUSTDOC_CSS: &str = include_str!(concat!(env!("OUT_DIR"), "/rustdoc.css"));
 const RUSTDOC_2021_12_05_CSS: &str =
     include_str!(concat!(env!("OUT_DIR"), "/rustdoc-2021-12-05.css"));
+const RUSTDOC_2025_08_20_CSS: &str =
+    include_str!(concat!(env!("OUT_DIR"), "/rustdoc-2025-08-20.css"));
 
 fn build_static_css_response(content: &'static str) -> impl IntoResponse {
     (
@@ -67,6 +69,10 @@ pub(crate) fn build_static_router() -> AxumRouter {
             "/rustdoc-2021-12-05.css",
             get_static(|| async { build_static_css_response(RUSTDOC_2021_12_05_CSS) }),
         )
+        .route(
+            "/rustdoc-2025-08-20.css",
+            get_static(|| async { build_static_css_response(RUSTDOC_2025_08_20_CSS) }),
+        )
         .fallback_service(
             get_service(ServeDir::new("static").fallback(ServeDir::new("vendor")))
                 .layer(middleware::from_fn(set_needed_static_headers))

templates/style/rustdoc-2025-08-20.scss

@@ -0,0 +1,10 @@
+@import "rustdoc-2021-12-05";
+
+// This file is needed to overload the previous docs.rs style. It is added into crates generated
+// using rustdoc after https://github.com/rust-lang/rust/pull/144476 has been merged.
+
+.rustdoc.src {
+    #sidebar-button {
+        top: calc(8px + #{$top-navbar-height});
+    }
+}