Rollup merge of #100374 - GuillaumeGomez:improve_rustdoc_search_results_page_crates_selection, r=notriddle

Improve crate selection on rustdoc search results page

Take over of #98855 (screenshots and explanations are there).

You can test it [here](https://rustdoc.crud.net/imperio/improve_rustdoc_search_results_page_crates_selection/std/index.html?search=test).

cc ``@steffahn`` ``@jsha``
r? ``@notriddle``

10 files changed, 116 insertions, 68 deletions

diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 699238017c7..ec2e129c364 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -1439,6 +1439,8 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     map.insert("not-displayed".into(), 1);
     map.insert("alternative-display".into(), 1);
     map.insert("search".into(), 1);
+    map.insert("crate-search".into(), 1);
+    map.insert("crate-search-div".into(), 1);
     // This is the list of IDs used in HTML generated in Rust (including the ones
     // used in tera template files).
     map.insert("mainThemeStyle".into(), 1);
@@ -1446,7 +1448,6 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     map.insert("settings-menu".into(), 1);
     map.insert("help-button".into(), 1);
     map.insert("main-content".into(), 1);
-    map.insert("crate-search".into(), 1);
     map.insert("toggle-all-docs".into(), 1);
     map.insert("all-types".into(), 1);
     map.insert("default-settings".into(), 1);
diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index 83fe14550cc..710ca3ee7c7 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -947,18 +947,33 @@ table,
 	height: 100%;
 }
 .search-results-title {
-	display: inline;
+	margin-top: 0;
+	white-space: nowrap;
+	/* flex layout allows shrinking the <select> appropriately if it becomes too large */
+	display: inline-flex;
+	max-width: 100%;
+	/* make things look like in a line, despite the fact that we're using a layout
+	with boxes (i.e. from the flex layout) */
+	align-items: baseline;
 }
-#search-settings {
-	font-size: 1.5rem;
-	font-weight: 500;
-	margin-bottom: 20px;
+#crate-search-div {
+	display: inline-block;
+	/* ensures that 100% in properties of #crate-search-div:after
+	are relative to the size of this div */
+	position: relative;
+	/* allows this div (and with it the <select>-element "#crate-search") to be shrunk */
+	min-width: 5em;
 }
 #crate-search {
 	min-width: 115px;
-	margin-top: 5px;
-	padding-left: 0.15em;
+	padding: 0;
+	/* keep these two in sync with "@-moz-document url-prefix()" below */
+	padding-left: 4px;
 	padding-right: 23px;
+	/* prevents the <select> from overflowing the containing div in case it's shrunk */
+	max-width: 100%;
+	/* contents can overflow because of max-width limit, then show ellipsis */
+	text-overflow: ellipsis;
 	border: 1px solid;
 	border-radius: 4px;
 	outline: none;
@@ -966,13 +981,37 @@ table,
 	-moz-appearance: none;
 	-webkit-appearance: none;
 	/* Removes default arrow from firefox */
+	text-indent: 0.01px;
+	background-color: var(--main-background-color);
+}
+/* cancel stylistic differences in padding in firefox
+for "appearance: none"-style (or equivalent) <select>s */
+@-moz-document url-prefix() {
+	#crate-search {
+		padding-left: 0px; /* == 4px - 4px */
+		padding-right: 19px; /* == 23px - 4px */
+	}
+}
+/* pseudo-element for holding the dropdown-arrow image; needs to be a separate thing
+so that we can apply CSS-filters to change the arrow color in themes */
+#crate-search-div::after {
+	/* lets clicks through! */
+	pointer-events: none;
+	/* completely covers the underlying div */
+	width: 100%;
+	height: 100%;
+	position: absolute;
+	top: 0;
+	left: 0;
+	content: "";
 	background-repeat: no-repeat;
-	background-color: transparent;
 	background-size: 20px;
-	background-position: calc(100% - 1px) 56%;
+	background-position: calc(100% - 2px) 56%;
+	/* image is black color, themes should apply a "filter" property to change the color */
 	background-image: /* AUTOREPLACE: */url("down-arrow.svg");
-	max-width: 100%;
-	text-overflow: ellipsis;
+}
+#crate-search > option {
+	font-size: 1rem;
 }
 .search-container {
 	margin-top: 4px;
diff --git a/src/librustdoc/html/static/css/themes/ayu.css b/src/librustdoc/html/static/css/themes/ayu.css
index b18d12d24e5..39a4dae3348 100644
--- a/src/librustdoc/html/static/css/themes/ayu.css
+++ b/src/librustdoc/html/static/css/themes/ayu.css
@@ -182,7 +182,7 @@ details.rustdoc-toggle > summary::before {
 	filter: invert(100%);
 }
 
-#crate-search, .search-input {
+.search-input {
 	background-color: #141920;
 	border-color: #424c57;
 }
@@ -191,7 +191,17 @@ details.rustdoc-toggle > summary::before {
 	/* Without the `!important`, the border-color is ignored for `<select>`...
 	   It cannot be in the group above because `.search-input` has a different border color on
 	   hover. */
-	border-color: #424c57 !important;
+	border-color: #5c6773 !important;
+}
+#crate-search-div::after {
+	/* match border-color; uses https://codepen.io/sosuke/pen/Pjoqqp */
+	filter: invert(41%) sepia(12%) saturate(487%) hue-rotate(171deg) brightness(94%) contrast(94%);
+}
+#crate-search:hover, #crate-search:focus {
+	border-color: #e0e0e0 !important;
+}
+#crate-search-div:hover::after, #crate-search-div:focus-within::after {
+	filter: invert(98%) sepia(12%) saturate(81%) hue-rotate(343deg) brightness(113%) contrast(76%);
 }
 
 .search-input {
diff --git a/src/librustdoc/html/static/css/themes/dark.css b/src/librustdoc/html/static/css/themes/dark.css
index a9d956e227c..6188e0ac0a9 100644
--- a/src/librustdoc/html/static/css/themes/dark.css
+++ b/src/librustdoc/html/static/css/themes/dark.css
@@ -152,7 +152,7 @@ details.rustdoc-toggle > summary::before {
 	filter: invert(100%);
 }
 
-#crate-search, .search-input {
+.search-input {
 	color: #111;
 	background-color: #f0f0f0;
 	border-color: #f0f0f0;
@@ -162,7 +162,17 @@ details.rustdoc-toggle > summary::before {
 	/* Without the `!important`, the border-color is ignored for `<select>`...
 	   It cannot be in the group above because `.search-input` has a different border color on
 	   hover. */
-	border-color: #f0f0f0 !important;
+	border-color: #d2d2d2 !important;
+}
+#crate-search-div::after {
+	/* match border-color; uses https://codepen.io/sosuke/pen/Pjoqqp */
+	filter: invert(94%) sepia(0%) saturate(721%) hue-rotate(255deg) brightness(90%) contrast(90%);
+}
+#crate-search:hover, #crate-search:focus {
+	border-color: #2196f3 !important;
+}
+#crate-search-div:hover::after, #crate-search-div:focus-within::after {
+	filter: invert(69%) sepia(60%) saturate(6613%) hue-rotate(184deg) brightness(100%) contrast(91%);
 }
 
 .search-input {
diff --git a/src/librustdoc/html/static/css/themes/light.css b/src/librustdoc/html/static/css/themes/light.css
index 458e5de3f85..fba790b6193 100644
--- a/src/librustdoc/html/static/css/themes/light.css
+++ b/src/librustdoc/html/static/css/themes/light.css
@@ -144,17 +144,26 @@ details.rustdoc-toggle > summary::before {
 	color: #999;
 }
 
-#crate-search, .search-input {
+.search-input {
 	background-color: white;
 	border-color: #e0e0e0;
 }
-
 #crate-search {
 	/* Without the `!important`, the border-color is ignored for `<select>`...
 	   It cannot be in the group above because `.search-input` has a different border color on
 	   hover. */
 	border-color: #e0e0e0 !important;
 }
+#crate-search-div::after {
+	/* match border-color; uses https://codepen.io/sosuke/pen/Pjoqqp */
+	filter: invert(100%) sepia(0%) saturate(4223%) hue-rotate(289deg) brightness(114%) contrast(76%);
+}
+#crate-search:hover, #crate-search:focus {
+	border-color: #717171 !important;
+}
+#crate-search-div:hover::after, #crate-search-div:focus-within::after {
+	filter: invert(44%) sepia(18%) saturate(23%) hue-rotate(317deg) brightness(96%) contrast(93%);
+}
 
 .search-input:focus {
 	border-color: #66afe9;
@@ -317,7 +326,7 @@ kbd {
 
 .popover, .popover::before,
 #help-button span.top, #help-button span.bottom {
-	border-color: #DDDDDD;
+	border-color: #e0e0e0;
 }
 
 #copy-path {
diff --git a/src/librustdoc/html/static/images/down-arrow.svg b/src/librustdoc/html/static/images/down-arrow.svg
index 35437e77a71..5d76a64e92c 100644
--- a/src/librustdoc/html/static/images/down-arrow.svg
+++ b/src/librustdoc/html/static/images/down-arrow.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" id="Layer_1" width="128" height="128" enable-background="new 0 0 128 128" version="1.1" viewBox="-30 -20 176 176" xml:space="preserve"><g><line x1="111" x2="64" y1="40.5" y2="87.499" fill="none" stroke="#2F3435" stroke-linecap="square" stroke-miterlimit="10" stroke-width="12"/><line x1="64" x2="17" y1="87.499" y2="40.5" fill="none" stroke="#2F3435" stroke-linecap="square" stroke-miterlimit="10" stroke-width="12"/></g></svg>
\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" id="Layer_1" width="128" height="128" enable-background="new 0 0 128 128" version="1.1" viewBox="-30 -20 176 176" xml:space="preserve"><g><line x1="111" x2="64" y1="40.5" y2="87.499" fill="none" stroke="#000000" stroke-linecap="square" stroke-miterlimit="10" stroke-width="12"/><line x1="64" x2="17" y1="87.499" y2="40.5" fill="none" stroke="#000000" stroke-linecap="square" stroke-miterlimit="10" stroke-width="12"/></g></svg>
\ No newline at end of file
diff --git a/src/librustdoc/html/static/js/search.js b/src/librustdoc/html/static/js/search.js
index 75c7bd45a29..d04ec357c40 100644
--- a/src/librustdoc/html/static/js/search.js
+++ b/src/librustdoc/html/static/js/search.js
@@ -429,9 +429,9 @@ function initSearch(rawSearchIndex) {
             }
             const posBefore = parserState.pos;
             getNextElem(query, parserState, elems, endChar === ">");
-            // This case can be encountered if `getNextElem` encounted a "stop character" right from
-            // the start. For example if you have `,,` or `<>`. In this case, we simply move up the
-            // current position to continue the parsing.
+            // This case can be encountered if `getNextElem` encountered a "stop character" right
+            // from the start. For example if you have `,,` or `<>`. In this case, we simply move up
+            // the current position to continue the parsing.
             if (posBefore === parserState.pos) {
                 parserState.pos += 1;
             }
@@ -581,7 +581,7 @@ function initSearch(rawSearchIndex) {
         const elem = document.getElementById("crate-search");
 
         if (elem &&
-            elem.value !== "All crates" &&
+            elem.value !== "all crates" &&
             hasOwnPropertyRustdoc(rawSearchIndex, elem.value)
         ) {
             return elem.value;
@@ -1551,12 +1551,6 @@ function initSearch(rawSearchIndex) {
         return [displayPath, href];
     }
 
-    function escape(content) {
-        const h1 = document.createElement("h1");
-        h1.textContent = content;
-        return h1.innerHTML;
-    }
-
     function pathSplitter(path) {
         const tmp = "<span>" + path.replace(/::/g, "::</span><span>");
         if (tmp.endsWith("<span>")) {
@@ -1710,22 +1704,15 @@ function initSearch(rawSearchIndex) {
         let crates = "";
         const crates_list = Object.keys(rawSearchIndex);
         if (crates_list.length > 1) {
-            crates = " in <select id=\"crate-search\"><option value=\"All crates\">" +
-                "All crates</option>";
+            crates = " in&nbsp;<div id=\"crate-search-div\"><select id=\"crate-search\">" +
+                "<option value=\"all crates\">all crates</option>";
             for (const c of crates_list) {
                 crates += `<option value="${c}" ${c === filterCrates && "selected"}>${c}</option>`;
             }
-            crates += "</select>";
-        }
-
-        let typeFilter = "";
-        if (results.query.typeFilter !== NO_TYPE_FILTER) {
-            typeFilter = " (type: " + escape(itemTypes[results.query.typeFilter]) + ")";
+            crates += "</select></div>";
         }
 
-        let output = "<div id=\"search-settings\">" +
-            `<h1 class="search-results-title">Results for ${escape(results.query.userQuery)}` +
-            `${typeFilter}</h1>${crates}</div>`;
+        let output = `<h1 class="search-results-title">Results${crates}</h1>`;
         if (results.query.error !== null) {
             output += `<h3>Query parser error: "${results.query.error}".</h3>`;
             output += "<div id=\"titles\">" +
@@ -2245,7 +2232,7 @@ function initSearch(rawSearchIndex) {
     }
 
     function updateCrate(ev) {
-        if (ev.target.value === "All crates") {
+        if (ev.target.value === "all crates") {
             // If we don't remove it from the URL, it'll be picked up again by the search.
             const params = searchState.getQueryStringParams();
             const query = searchState.input.value.trim();
diff --git a/src/test/rustdoc-gui/pocket-menu.goml b/src/test/rustdoc-gui/pocket-menu.goml
index 54f3790a765..782526e29f4 100644
--- a/src/test/rustdoc-gui/pocket-menu.goml
+++ b/src/test/rustdoc-gui/pocket-menu.goml
@@ -71,7 +71,7 @@ reload:
 click: "#help-button"
 assert-css: (
     "#help-button .popover",
-    {"display": "block", "border-color": "rgb(221, 221, 221)"},
+    {"display": "block", "border-color": "rgb(224, 224, 224)"},
 )
 compare-elements-css: ("#help-button .popover", "#help-button .top", ["border-color"])
 compare-elements-css: ("#help-button .popover", "#help-button .bottom", ["border-color"])
diff --git a/src/test/rustdoc-gui/search-filter.goml b/src/test/rustdoc-gui/search-filter.goml
index d645e237061..b12eddfd12a 100644
--- a/src/test/rustdoc-gui/search-filter.goml
+++ b/src/test/rustdoc-gui/search-filter.goml
@@ -40,7 +40,7 @@ press-key: "ArrowUp"
 press-key: "Enter"
 // Waiting for the search results to appear...
 wait-for: "#titles"
-assert-property: ("#crate-search", {"value": "All crates"})
+assert-property: ("#crate-search", {"value": "all crates"})
 
 // Checking that the URL parameter is taken into account for crate filtering.
 goto: file://|DOC_PATH|/test_docs/index.html?search=test&filter-crate=lib2
@@ -48,8 +48,8 @@ wait-for: "#crate-search"
 assert-property: ("#crate-search", {"value": "lib2"})
 assert-false: "#results .externcrate"
 
-// Checking that the text for the "title" is correct (the "All" comes from the "<select>").
-assert-text: ("#search-settings", "Results for test in All", STARTS_WITH)
+// Checking that the text for the "title" is correct (the "all crates" comes from the "<select>").
+assert-text: (".search-results-title", "Results in all crates", STARTS_WITH)
 
 // Checking the display of the crate filter.
 // We start with the light theme.
@@ -69,15 +69,15 @@ click: "#settings-menu"
 wait-for: "#settings"
 click: "#theme-dark"
 wait-for-css: ("#crate-search", {
-    "border": "1px solid rgb(240, 240, 240)",
-    "color": "rgb(17, 17, 17)",
-    "background-color": "rgb(240, 240, 240)",
+    "border": "1px solid rgb(210, 210, 210)",
+    "color": "rgb(221, 221, 221)",
+    "background-color": "rgb(53, 53, 53)",
 })
 
 // And finally we check the ayu theme.
 click: "#theme-ayu"
 wait-for-css: ("#crate-search", {
-    "border": "1px solid rgb(66, 76, 87)",
-    "color": "rgb(197, 197, 197)",
-    "background-color": "rgb(20, 25, 32)",
+    "border": "1px solid rgb(92, 103, 115)",
+    "color": "rgb(255, 255, 255)",
+    "background-color": "rgb(15, 20, 25)",
 })
diff --git a/src/test/rustdoc-gui/search-result-display.goml b/src/test/rustdoc-gui/search-result-display.goml
index 8464ba7c23c..db4907924fa 100644
--- a/src/test/rustdoc-gui/search-result-display.goml
+++ b/src/test/rustdoc-gui/search-result-display.goml
@@ -4,7 +4,7 @@ size: (900, 1000)
 write: (".search-input", "test")
 // To be SURE that the search will be run.
 press-key: 'Enter'
-wait-for: "#search-settings"
+wait-for: "#crate-search"
 // The width is returned by "getComputedStyle" which returns the exact number instead of the
 // CSS rule which is "50%"...
 assert-css: (".search-results div.desc", {"width": "295px"})
@@ -17,13 +17,9 @@ assert-css: (".search-results div.desc", {"width": "570px"})
 // To do so we need to update the length of one of its `<option>`.
 size: (900, 900)
 
-// First we check the current width and position.
-assert-css: ("#crate-search", {"width": "218px"})
-compare-elements-position-near: (
-    "#crate-search",
-    "#search-settings .search-results-title",
-    {"y": 5},
-)
+// First we check the current width, height and position.
+assert-css: ("#crate-search", {"width": "223px"})
+assert-css: (".search-results-title", {"height": "44px", "width": "336px"})
 
 // Then we update the text of one of the `<option>`.
 text: (
@@ -31,12 +27,8 @@ text: (
     "sdjfaksdjfaksjdbfkadsbfkjsadbfkdsbkfbsadkjfbkdsabfkadsfkjdsafa",
 )
 
-// Then we compare again.
-assert-css: ("#crate-search", {"width": "640px"})
-compare-elements-position-near-false: (
-    "#crate-search",
-    "#search-settings .search-results-title",
-    {"y": 5},
-)
-// And we check that the `<select>` isn't bigger than its container.
+// Then we compare again to confirm the height didn't change.
+assert-css: ("#crate-search", {"width": "527px"})
+assert-css: (".search-results-title", {"height": "44px", "width": "640px"})
+// And we check that the `<select>` isn't bigger than its container (".search-results-title").
 assert-css: ("#search", {"width": "640px"})