re-add --disable-minification to rustdoc

this also makes the rust.docs-minification option work
as advertised in config.toml

nothing fancy this time, this is intended to be perma-unstable.
it's only really here for the benefit of rustdoc devs.

mitegates #135345

src/librustdoc/config.rs

@@ -303,6 +303,8 @@ pub(crate) struct RenderOptions {
     pub(crate) include_parts_dir: Vec<PathToParts>,
     /// Where to write crate-info
     pub(crate) parts_out_dir: Option<PathToParts>,
+    /// disable minification of CSS/JS
+    pub(crate) disable_minification: bool,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
@@ -781,6 +783,9 @@ impl Options {
 
         let unstable_features =
             rustc_feature::UnstableFeatures::from_environment(crate_name.as_deref());
+
+        let disable_minification = matches.opt_present("disable-minification");
+
         let options = Options {
             bin_crate,
             proc_macro_crate,
@@ -857,6 +862,7 @@ impl Options {
             should_merge,
             include_parts_dir,
             parts_out_dir,
+            disable_minification,
         };
         Some((input, options, render_options))
     }

src/librustdoc/html/render/write_shared.rs

@@ -207,7 +207,15 @@ fn write_static_files(
     if opt.emit.is_empty() || opt.emit.contains(&EmitType::Toolchain) {
         static_files::for_each(|f: &static_files::StaticFile| {
             let filename = static_dir.join(f.output_filename());
-            fs::write(&filename, f.minified()).map_err(|e| PathError::new(e, &filename))
+            let contents: &[u8];
+            let contents_vec: Vec<u8>;
+            if dbg!(opt.disable_minification) {
+                contents = f.bytes;
+            } else {
+                contents_vec = f.minified();
+                contents = &contents_vec;
+            };
+            fs::write(&filename, contents).map_err(|e| PathError::new(e, &filename))
         })?;
     }
 

src/librustdoc/lib.rs

@@ -651,8 +651,15 @@ fn opts() -> Vec<RustcOptGroup> {
             "",
             "add arguments to be used when compiling doctests",
         ),
+        opt(
+            Unstable,
+            FlagMulti,
+            "",
+            "disable-minification",
+            "diable the minification of CSS/JS files",
+            "",
+        ),
         // deprecated / removed options
-        opt(Unstable, FlagMulti, "", "disable-minification", "removed", ""),
         opt(
             Stable,
             Multi,