Rustdoc style cleanups

- Make "since" version numbers grey again (regressed in #92602).
 - Remove unneeded selectors for when crate filter dropdown is a
   sibling of search-input.
 - Crate filter dropdown doesn't need to be 100% width on mobile.
 - Only build crate filter dropdown when there is more than one crate.
 - Remove unused addCrateDropdown.

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

@@ -934,11 +934,6 @@ h2.small-section-header > .anchor {
 	width: 100%;
 }
 
-#crate-search + .search-input {
-	border-radius: 0 1px 1px 0;
-	width: calc(100% - 32px);
-}
-
 .search-input:focus {
 	border-radius: 2px;
 	border: 0;
@@ -2070,16 +2065,10 @@ details.rustdoc-toggle[open] > summary.hideme::after {
 	}
 
 	#crate-search {
-		width: 100%;
 		border-radius: 4px;
 		border: 0;
 	}
 
-	#crate-search + .search-input {
-		width: calc(100% + 71px);
-		margin-left: -36px;
-	}
-
 	#theme-picker, #settings-menu {
 		padding: 5px;
 		width: 31px;

src/librustdoc/html/static/css/themes/ayu.css

@@ -299,7 +299,8 @@ details.undocumented > summary::before {
 	border-color: #5c6773;
 }
 
-.since {
+.rightside,
+.out-of-band {
 	color: grey;
 }
 

src/librustdoc/html/static/css/themes/dark.css

@@ -256,7 +256,8 @@ details.undocumented > summary::before {
 	background: rgba(0,0,0,0);
 }
 
-.since {
+.rightside,
+.out-of-band {
 	color: grey;
 }
 

src/librustdoc/html/static/css/themes/light.css

@@ -243,6 +243,11 @@ details.undocumented > summary::before {
 	border-color: #bfbfbf;
 }
 
+.rightside,
+.out-of-band {
+	color: grey;
+}
+
 .result-name .primitive > i, .result-name .keyword > i {
 	color: black;
 }

src/librustdoc/html/static/js/main.js

@@ -283,9 +283,6 @@ function hideThemeButtonState() {
                 loadSearch();
             }
 
-            // `crates{version}.js` should always be loaded before this script, so we can use it
-            // safely.
-            searchState.addCrateDropdown(window.ALL_CRATES);
             var params = searchState.getQueryStringParams();
             if (params.search !== undefined) {
                 var search = searchState.outputElement();
@@ -295,30 +292,6 @@ function hideThemeButtonState() {
                 loadSearch();
             }
         },
-        addCrateDropdown: function(crates) {
-            var elem = document.getElementById("crate-search");
-
-            if (!elem) {
-                return;
-            }
-            var savedCrate = getSettingValue("saved-filter-crate");
-            for (var i = 0, len = crates.length; i < len; ++i) {
-                var option = document.createElement("option");
-                option.value = crates[i];
-                option.innerText = crates[i];
-                elem.appendChild(option);
-                // Set the crate filter from saved storage, if the current page has the saved crate
-                // filter.
-                //
-                // If not, ignore the crate filter -- we want to support filtering for crates on
-                // sites like doc.rust-lang.org where the crates may differ from page to page while
-                // on the
-                // same domain.
-                if (crates[i] === savedCrate) {
-                    elem.value = savedCrate;
-                }
-            }
-        },
     };
 
     function getPageId() {

src/librustdoc/html/static/js/search.js

@@ -1126,15 +1126,18 @@ window.initSearch = function(rawSearchIndex) {
             }
         }
 
-        let crates = `<select id="crate-search"><option value="All crates">All crates</option>`;
-        for (let c of window.ALL_CRATES) {
-            crates += `<option value="${c}" ${c == filterCrates && "selected"}>${c}</option>`;
+        let crates = "";
+        if (window.ALL_CRATES.length > 1) {
+            crates = ` in <select id="crate-search"><option value="All crates">All crates</option>`;
+            for (let c of window.ALL_CRATES) {
+                crates += `<option value="${c}" ${c == filterCrates && "selected"}>${c}</option>`;
+            }
+            crates += `</select>`;
         }
-        crates += `</select>`;
         var output = `<div id="search-settings">
             <h1 class="search-results-title">Results for ${escape(query.query)} ` +
             (query.type ? " (type: " + escape(query.type) + ")" : "") + "</h1>" +
-            ` in ${crates} ` +
+            crates +
             `</div><div id="titles">` +
             makeTabHeader(0, "In Names", ret_others[1]) +
             makeTabHeader(1, "In Parameters", ret_in_args[1]) +
@@ -1148,7 +1151,10 @@ window.initSearch = function(rawSearchIndex) {
         resultsElem.appendChild(ret_returned[0]);
 
         search.innerHTML = output;
-        document.getElementById("crate-search").addEventListener("input", updateCrate);
+        let crateSearch = document.getElementById("crate-search");
+        if (crateSearch) {
+            crateSearch.addEventListener("input", updateCrate);
+        }
         search.appendChild(resultsElem);
         // Reset focused elements.
         searchState.focusedByTab = [null, null, null];