Rollup merge of rust-lang#55191 - GuillaumeGomez:fix-sub-variant, r=QuietMisdreavus

Fix sub-variant doc display

Fixes rust-lang#54758.

<img width="1440" alt="screen shot 2018-10-19 at 01 34 11" src="https://user-images.githubusercontent.com/3050060/47189939-43481d00-d33f-11e8-868f-cf479fc79e62.png">

r? @QuietMisdreavus

Author: kennytm

src/librustdoc/html/render.rs

@@ -3379,10 +3379,10 @@ fn item_enum(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
                 let variant_id = cx.derive_id(format!("{}.{}.fields",
                                                    ItemType::Variant,
                                                    variant.name.as_ref().unwrap()));
-                write!(w, "<span class='docblock autohide sub-variant' id='{id}'>",
+                write!(w, "<span class='autohide sub-variant' id='{id}'>",
                        id = variant_id)?;
-                write!(w, "<h3 class='fields'>Fields of <code>{name}</code></h3>\n
-                           <table>", name = variant.name.as_ref().unwrap())?;
+                write!(w, "<h3>Fields of <b>{name}</b></h3><div>",
+                       name = variant.name.as_ref().unwrap())?;
                 for field in &s.fields {
                     use clean::StructFieldItem;
                     if let StructFieldItem(ref ty) = field.inner {
@@ -3394,19 +3394,18 @@ fn item_enum(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
                                                       ItemType::Variant.name_space(),
                                                       field.name.as_ref().unwrap(),
                                                       ItemType::StructField.name_space()));
-                        write!(w, "<tr><td \
-                                   id='{id}'>\
-                                   <span id='{ns_id}' class='invisible'>\
-                                   <code>{f}:&nbsp;{t}</code></span></td><td>",
+                        write!(w, "<span id=\"{id}\" class=\"variant small-section-header\">\
+                                   <a href=\"#{id}\" class=\"anchor field\"></a>\
+                                   <span id='{ns_id}' class='invisible'><code>{f}:&nbsp;{t}\
+                                   </code></span></span>",
                                id = id,
                                ns_id = ns_id,
                                f = field.name.as_ref().unwrap(),
                                t = *ty)?;
                         document(w, cx, field)?;
-                        write!(w, "</td></tr>")?;
                     }
                 }
-                write!(w, "</table></span>")?;
+                write!(w, "</div></span>")?;
             }
             render_stability_since(w, variant, it)?;
         }

src/librustdoc/html/static/main.js

@@ -1886,7 +1886,7 @@
             if (hasClass(relatedDoc, "stability")) {
                 relatedDoc = relatedDoc.nextElementSibling;
             }
-            if (hasClass(relatedDoc, "docblock")) {
+            if (hasClass(relatedDoc, "docblock") || hasClass(relatedDoc, "sub-variant")) {
                 var action = mode;
                 if (action === "toggle") {
                     if (hasClass(relatedDoc, "hidden-by-usual-hider")) {
@@ -2094,15 +2094,13 @@
     }
 
     var hideItemDeclarations = getCurrentValue('rustdoc-item-declarations') === "false";
-    onEach(document.getElementsByClassName('docblock'), function(e) {
+    function buildToggleWrapper(e) {
         if (hasClass(e, 'autohide')) {
             var wrap = e.previousElementSibling;
             if (wrap && hasClass(wrap, 'toggle-wrapper')) {
                 var toggle = wrap.childNodes[0];
-                var extra = false;
-                if (e.childNodes[0].tagName === 'H3') {
-                    extra = true;
-                }
+                var extra = e.childNodes[0].tagName === 'H3';
+
                 e.style.display = 'none';
                 addClass(wrap, 'collapsed');
                 onEach(toggle.getElementsByClassName('inner'), function(e) {
@@ -2127,6 +2125,8 @@
                 if (hideItemDeclarations === false) {
                     extraClass = 'collapsed';
                 }
+            } else if (hasClass(e, "sub-variant")) {
+                otherMessage = ' Show fields';
             } else if (hasClass(e, "non-exhaustive")) {
                 otherMessage = ' This ';
                 if (hasClass(e, "non-exhaustive-struct")) {
@@ -2150,7 +2150,10 @@
                 collapseDocs(e.previousSibling.childNodes[0], "toggle");
             }
         }
-    });
+    }
+
+    onEach(document.getElementsByClassName('docblock'), buildToggleWrapper);
+    onEach(document.getElementsByClassName('sub-variant'), buildToggleWrapper);
 
     function createToggleWrapper(tog) {
         var span = document.createElement('span');

src/librustdoc/html/static/rustdoc.css

@@ -517,6 +517,10 @@ h4 > code, h3 > code, .invisible > code {
 	margin-top: -13px;
 }
 
+.sub-variant > div > .stability {
+	margin-top: initial;
+}
+
 .content .stability::before {
 	content: '˪';
 	font-size: 30px;
@@ -866,7 +870,23 @@ span.since {
 }
 
 .sub-variant, .sub-variant > h3 {
-	margin-top: 0 !important;
+	margin-top: 1px !important;
+}
+
+#main > .sub-variant > h3 {
+	font-size: 15px;
+	margin-left: 25px;
+	margin-bottom: 5px;
+}
+
+.sub-variant > div {
+	margin-left: 20px;
+	margin-bottom: 10px;
+}
+
+.sub-variant > div > span {
+	display: block;
+	position: relative;
 }
 
 .toggle-label {