doc: Fold inline methods from Deref

Author: tesuji

src/librustdoc/html/render/mod.rs

@@ -1256,6 +1256,7 @@ fn render_assoc_items_inner(
 letSome(v) = cache.impls.get(&it)else{return};
 let(non_trait, traits):(Vec<_>,_) = v.iter().partition(|i| i.inner_impl().trait_.is_none());
 if !non_trait.is_empty(){
+letmut close_tags = <Vec<&str>>::with_capacity(1);
 letmut tmp_buf = Buffer::html();
 let(render_mode, id, class_html) = match what {
 AssocItemRender::All => {
@@ -1266,6 +1267,8 @@ fn render_assoc_items_inner(
 let id =
  cx.derive_id(small_url_encode(format!("deref-methods-{:#}", type_.print(cx))));
 let derived_id = cx.derive_id(&id);
+ tmp_buf.write_str("<details class=\"toggle implementors-toggle\" open><summary>");
+ close_tags.push("</details>");
 write_impl_section_heading(
 &mut tmp_buf,
 &format!(
@@ -1275,6 +1278,7 @@ fn render_assoc_items_inner(
 ),
 &id,
 );
+ tmp_buf.write_str("</summary>");
 ifletSome(def_id) = type_.def_id(cx.cache()){
  cx.deref_id_map.insert(def_id, id);
 }
@@ -1308,6 +1312,9 @@ fn render_assoc_items_inner(
  impls_buf.into_inner()
 )
 .unwrap();
+for tag in close_tags.into_iter().rev(){
+ w.write_str(tag).unwrap();
+}
 }
 }
 
@@ -1565,7 +1572,7 @@ fn render_impl(
 let cache = &shared.cache;
 let traits = &cache.traits;
 let trait_ = i.trait_did().map(|did| &traits[&did]);
-letmut close_tags = String::new();
+letmut close_tags = <Vec<&str>>::with_capacity(2);
 
 // For trait implementations, the `interesting` output contains all methods that have doc
 // comments, and the `boring` output contains all methods that do not. The distinction is
@@ -1853,7 +1860,7 @@ fn render_impl(
 if render_mode == RenderMode::Normal{
 let toggled = !(impl_items.is_empty() && default_impl_items.is_empty());
 if toggled {
- close_tags.insert_str(0,"</details>");
+ close_tags.push("</details>");
 write!(
  w,
 "<details class=\"toggle implementors-toggle\"{}>\
@@ -1899,14 +1906,16 @@ fn render_impl(
 }
 if !default_impl_items.is_empty() || !impl_items.is_empty(){
  w.write_str("<div class=\"impl-items\">");
- close_tags.insert_str(0,"</div>");
+ close_tags.push("</div>");
 }
 }
 if !default_impl_items.is_empty() || !impl_items.is_empty(){
  w.push_buffer(default_impl_items);
  w.push_buffer(impl_items);
 }
- w.write_str(&close_tags);
+for tag in close_tags.into_iter().rev(){
+ w.write_str(tag);
+}
 }
 
 // Render the items that appear on the right side of methods, impls, and

src/librustdoc/html/static/css/rustdoc.css

@@ -1733,6 +1733,11 @@ details.toggle {
 position: relative;
 }
 
+details.implementors-toggle {
+/* This makes [-] on the same line as <summary>. */
+contain: inline-size;
+}
+
 /* The hideme class is used on summary tags that contain a span with
 	placeholder text shown only when the toggle is closed. For instance,
 	"Expand description" or "Show methods". */