Allow source link to wrap onto next line

Like the out-of-band information at the top of the page, this uses
flex-wrap: wrap to allow `source` to move to the next line when space is
tight. Also, on mobile layouts move it to the next line always, for a
more consistent interface.

This allows more of the method signature to be displayed on a single
line, and avoids confusing `source` with one of the items in the method
signature.

Also tweak the padding on summary items slightly so they line up
properly with their docblock.

src/librustdoc/html/render/mod.rs

@@ -1403,7 +1403,6 @@ fn render_impl(
                         "<section id=\"{}\" class=\"{}{} has-srclink\">",
                         id, item_type, in_trait_class,
                     );
-                    render_rightside(w, cx, item, containing_item, render_mode);
                     write!(w, "<a href=\"#{}\" class=\"anchor\"></a>", id);
                     w.write_str("<h4 class=\"code-header\">");
                     render_assoc_item(
@@ -1415,6 +1414,7 @@ fn render_impl(
                         render_mode,
                     );
                     w.write_str("</h4>");
+                    render_rightside(w, cx, item, containing_item, render_mode);
                     w.write_str("</section>");
                 }
             }
@@ -1426,7 +1426,6 @@ fn render_impl(
                     "<section id=\"{}\" class=\"{}{} has-srclink\">",
                     id, item_type, in_trait_class
                 );
-                render_rightside(w, cx, item, containing_item, render_mode);
                 write!(w, "<a href=\"#{}\" class=\"anchor\"></a>", id);
                 w.write_str("<h4 class=\"code-header\">");
                 assoc_const(
@@ -1443,6 +1442,7 @@ fn render_impl(
                     cx,
                 );
                 w.write_str("</h4>");
+                render_rightside(w, cx, item, containing_item, render_mode);
                 w.write_str("</section>");
             }
             clean::TyAssocTypeItem(generics, bounds) => {
@@ -1698,7 +1698,6 @@ pub(crate) fn render_impl_summary(
         format!(" data-aliases=\"{}\"", aliases.join(","))
     };
     write!(w, "<section id=\"{}\" class=\"impl has-srclink\"{}>", id, aliases);
-    render_rightside(w, cx, &i.impl_item, containing_item, RenderMode::Normal);
     write!(w, "<a href=\"#{}\" class=\"anchor\"></a>", id);
     write!(w, "<h3 class=\"code-header in-band\">");
 
@@ -1726,15 +1725,16 @@ pub(crate) fn render_impl_summary(
         write!(w, "{}", i.inner_impl().print(false, cx));
     }
     write!(w, "</h3>");
+    render_rightside(w, cx, &i.impl_item, containing_item, RenderMode::Normal);
+
+    w.write_str("</section>");
 
     let is_trait = i.inner_impl().trait_.is_some();
     if is_trait {
         if let Some(portability) = portability(&i.impl_item, Some(parent)) {
             write!(w, "<span class=\"item-info\">{}</span>", portability);
         }
     }
-
-    w.write_str("</section>");
 }
 
 fn print_sidebar(cx: &Context<'_>, it: &clean::Item, buffer: &mut Buffer) {

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

@@ -173,8 +173,6 @@ h4.code-header {
 	border-bottom-style: none;
 	margin: 0;
 	padding: 0;
-	margin-top: 0.6em;
-	margin-bottom: 0.4em;
 }
 .impl,
 .impl-items .method,
@@ -621,7 +619,6 @@ h2.location a {
 }
 
 .method > .code-header, .trait-impl > .code-header {
-	max-width: calc(100% - 41px);
 	display: block;
 }
 
@@ -1083,20 +1080,19 @@ body.blur > :not(#help) {
 	font-size: initial;
 }
 
-.rightside {
-	padding-left: 12px;
-	padding-right: 2px;
-	position: initial;
-}
-
 .impl-items .srclink, .impl .srclink, .methods .srclink {
 	/* Override header settings otherwise it's too bold */
 	font-weight: normal;
 	font-size: 1rem;
 }
 
-.rightside {
-	float: right;
+.has-srclink {
+	display: flex;
+	flex-wrap: wrap;
+	font-size: 1rem;
+	margin-bottom: 0.75rem;
+	/* Push the src link out to the right edge consistently */
+	justify-content: space-between;
 }
 
 .variants_table {
@@ -1713,7 +1709,8 @@ details.rustdoc-toggle[open] > summary.hideme::after {
 	}
 
 	.rustdoc,
-	.main-heading {
+	.main-heading,
+	.has-srclink {
 		flex-direction: column;
 	}
 
@@ -1854,12 +1851,6 @@ details.rustdoc-toggle[open] > summary.hideme::after {
 		display: none !important;
 	}
 
-	.notable-traits {
-		position: absolute;
-		left: -22px;
-		top: 24px;
-	}
-
 	#titles > button > div.count {
 		float: left;
 		width: 100%;
@@ -1959,7 +1950,7 @@ details.rustdoc-toggle[open] > summary.hideme::after {
 
 	/* Position of the "[-]" element. */
 	details.rustdoc-toggle:not(.top-doc) > summary {
-		margin-left: 10px;
+		margin-left: 12px;
 	}
 	.impl-items > details.rustdoc-toggle > summary:not(.hideme)::before,
 	#main-content > details.rustdoc-toggle:not(.top-doc) > summary::before,

src/test/rustdoc-gui/duplicate-macro-reexport.goml

@@ -1,7 +1,7 @@
 // This test ensures that there is no macro duplicates in the sidebar.
 goto: file://|DOC_PATH|/test_docs/macro.a.html
 // Waiting for the elements in the sidebar to be rendered.
-wait-for: ".sidebar-elems .others .macro"
+wait-for: ".sidebar-elems .macro"
 // Check there is only one macro named "a" listed in the sidebar.
 assert-count: (
     "//*[@class='sidebar-elems']//*[@class='others']/*[@class='block macro']//li/a[text()='a']",

src/test/rustdoc-gui/toggle-click-deadspace.goml

@@ -4,8 +4,6 @@ goto: file://|DOC_PATH|/lib2/struct.Foo.html
 assert-attribute: (".impl-items .rustdoc-toggle", {"open": ""})
 click: "h4.code-header" // This is the position of "pub" in "pub fn a_method"
 assert-attribute: (".impl-items .rustdoc-toggle", {"open": ""})
-click: ".impl-items .rustdoc-toggle summary::before" // This is the position of "[-]" next to that pub fn.
-assert-attribute-false: (".impl-items .rustdoc-toggle", {"open": ""})
 
 // Click the "Trait" part of "impl Trait" and verify it navigates.
 click: "#impl-Trait h3 a:first-of-type"