Rollup merge of #104967 - willcrichton:fix-scrape-examples, r=notriddle

Fix UI issues with Rustdoc scrape-examples feature.

A few regressions have been introduced into scrape-examples in the last few months. This commit fixes those regressions:
* Help file was being loaded from the wrong place (introduced in f9e1f6ffdf).
* CSS selector in JS has a typo (introduced in 14897180ae).
* Line numbers in scraped example code snippets are overflowing (not sure if this was ever fixed). Changing from flexbox to grid display fixed this issue.

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

@@ -1978,7 +1978,9 @@ in storage.js
 }
 
 .scraped-example .code-wrapper .example-wrap {
-	flex: 1;
+	display: grid;
+	grid-template-columns: max-content auto;
+	width: 100%;
 	overflow-x: auto;
 	overflow-y: hidden;
 	margin-bottom: 0;

src/librustdoc/html/static/js/scrape-examples.js

@@ -57,7 +57,7 @@
                     });
                 });
 
-            example.querySelector("next")
+            example.querySelector(".next")
                 .addEventListener("click", () => {
                     onChangeLoc(() => {
                         locIndex = (locIndex + 1) % locs.length;

src/librustdoc/html/static_files.rs

@@ -130,4 +130,4 @@ static_files! {
     nanum_barun_gothic_license => "static/fonts/NanumBarunGothic-LICENSE.txt",
 }
 
-pub(crate) static SCRAPE_EXAMPLES_HELP_MD: &str = include_str!("static/js/scrape-examples.js");
+pub(crate) static SCRAPE_EXAMPLES_HELP_MD: &str = include_str!("static/scrape-examples-help.md");

src/test/rustdoc-gui/scrape-examples-button-focus.goml

@@ -1,4 +1,17 @@
 goto: "file://" + |DOC_PATH| + "/scrape_examples/fn.test.html"
+
+store-property: (initialScrollTop, ".scraped-example-list > .scraped-example pre", "scrollTop")
+focus: ".scraped-example-list > .scraped-example .next"
+press-key: "Enter"
+assert-property-false: (".scraped-example-list > .scraped-example pre", {
+	"scrollTop": |initialScrollTop|
+})
+focus: ".scraped-example-list > .scraped-example .prev"
+press-key: "Enter"
+assert-property: (".scraped-example-list > .scraped-example pre", {
+	"scrollTop": |initialScrollTop|
+})
+
 store-property: (smallOffsetHeight, ".scraped-example-list > .scraped-example pre", "offsetHeight")
 assert-property-false: (".scraped-example-list > .scraped-example pre", {
 	"scrollHeight": |smallOffsetHeight|

src/test/rustdoc-gui/src/scrape_examples/examples/check.rs

@@ -22,4 +22,5 @@ fn main() {
         println!("hello world!");
         println!("hello world!");
     }
+    scrape_examples::test();
 }