Rollup merge of #110964 - notriddle:notriddle/deref-impl, r=GuillaumeGomez

rustdoc: fix weird margins between Deref impl items

## Before

![image](https://user-images.githubusercontent.com/1593513/235245977-90770591-22c1-4a27-9464-248a3729a2b7.png)

## After

![image](https://user-images.githubusercontent.com/1593513/235246009-0e83113e-42b7-4e29-981d-969f9d20af01.png)

## Description

In the old setup, if the dereffed-to item has multiple impl blocks, each one gets its own `div.impl-items` in the section, but there are no headers separating them. Since the last method in a `div.impl-items` has no bottom margin, and there are no margins between these divs, there is no margin between the last method of one impl and the first method of the following impl.

This patch fixes it by simplifying the HTML. Each Deref block gets exactly one `div.impl-items`, no matter how many impl blocks it actually has.

src/librustdoc/html/render/mod.rs

@@ -1155,10 +1155,10 @@ fn render_assoc_items_inner(
     let (non_trait, traits): (Vec<_>, _) = v.iter().partition(|i| i.inner_impl().trait_.is_none());
     if !non_trait.is_empty() {
         let mut tmp_buf = Buffer::html();
-        let (render_mode, id) = match what {
+        let (render_mode, id, class_html) = match what {
             AssocItemRender::All => {
                 write_impl_section_heading(&mut tmp_buf, "Implementations", "implementations");
-                (RenderMode::Normal, "implementations-list".to_owned())
+                (RenderMode::Normal, "implementations-list".to_owned(), "")
             }
             AssocItemRender::DerefFor { trait_, type_, deref_mut_ } => {
                 let id =
@@ -1175,7 +1175,11 @@ fn render_assoc_items_inner(
                     ),
                     &id,
                 );
-                (RenderMode::ForDeref { mut_: deref_mut_ }, cx.derive_id(id))
+                (
+                    RenderMode::ForDeref { mut_: deref_mut_ },
+                    cx.derive_id(id),
+                    r#" class="impl-items""#,
+                )
             }
         };
         let mut impls_buf = Buffer::html();
@@ -1199,7 +1203,7 @@ fn render_assoc_items_inner(
         }
         if !impls_buf.is_empty() {
             write!(w, "{}", tmp_buf.into_inner()).unwrap();
-            write!(w, "<div id=\"{}\">", id).unwrap();
+            write!(w, "<div id=\"{id}\"{class_html}>").unwrap();
             write!(w, "{}", impls_buf.into_inner()).unwrap();
             w.write_str("</div>").unwrap();
         }
@@ -1788,12 +1792,14 @@ fn render_default_items(
                 .into_string()
             );
         }
+        if !default_impl_items.is_empty() || !impl_items.is_empty() {
+            w.write_str("<div class=\"impl-items\">");
+            close_tags.insert_str(0, "</div>");
+        }
     }
     if !default_impl_items.is_empty() || !impl_items.is_empty() {
-        w.write_str("<div class=\"impl-items\">");
         w.push_buffer(default_impl_items);
         w.push_buffer(impl_items);
-        close_tags.insert_str(0, "</div>");
     }
     w.write_str(&close_tags);
 }

tests/rustdoc/deref/deref-multiple-impl-blocks.rs

@@ -0,0 +1,43 @@
+#![crate_name="foo"]
+
+use std::ops::{Deref, DerefMut};
+
+// @has foo/struct.Vec.html
+// @count - '//h2[@id="deref-methods-Slice"]' 1
+// @count - '//div[@id="deref-methods-Slice-1"]' 1
+// @count - '//div[@id="deref-methods-Slice-1"][@class="impl-items"]' 1
+// @count - '//div[@id="deref-methods-Slice-1"]/div[@class="impl-items"]' 0
+pub struct Vec;
+
+pub struct Slice;
+
+impl Deref for Vec {
+    type Target = Slice;
+    fn deref(&self) -> &Slice {
+        &Slice
+    }
+}
+
+impl DerefMut for Vec {
+    fn deref_mut(&mut self) -> &mut Slice {
+        &mut Slice
+    }
+}
+
+impl Slice {
+    pub fn sort_floats(&mut self) {
+        todo!();
+    }
+}
+
+impl Slice {
+    pub fn sort(&mut self) {
+        todo!();
+    }
+}
+
+impl Slice {
+    pub fn len(&self) {
+        todo!();
+    }
+}