Rollup merge of #88816 - dns2utf8:rustdoc_test_gui_2k_constants, r=GuillaumeGomez

Rustdoc migrate to table so the gui can handle >2k constants

Closes #88545.

This PR adds a test for overlapping entries in the `item-table` https://github.com/rust-lang/rust/issues/88545
It currently includes the commit with the workaround from https://github.com/rust-lang/rust/pull/88776

7 files changed, 44 insertions, 22 deletions

diff --git a/src/librustdoc/html/render/print_item.rs b/src/librustdoc/html/render/print_item.rs
index fa0d211efe6..28b2eded7cc 100644
--- a/src/librustdoc/html/render/print_item.rs
+++ b/src/librustdoc/html/render/print_item.rs
@@ -34,6 +34,8 @@ use crate::html::markdown::MarkdownSummaryLine;
 
 const ITEM_TABLE_OPEN: &'static str = "<div class=\"item-table\">";
 const ITEM_TABLE_CLOSE: &'static str = "</div>";
+const ITEM_TABLE_ROW_OPEN: &'static str = "<div class=\"item-row\">";
+const ITEM_TABLE_ROW_CLOSE: &'static str = "</div>";
 
 pub(super) fn print_item(cx: &Context<'_>, item: &clean::Item, buf: &mut Buffer, page: &Page<'_>) {
     debug_assert!(!item.is_stripped());
@@ -256,9 +258,6 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
 
     debug!("{:?}", indices);
     let mut curty = None;
-    // See: https://github.com/rust-lang/rust/issues/88545
-    let item_table_block_size = 900usize;
-    let mut item_table_nth_element = 0usize;
 
     for &idx in &indices {
         let myitem = &items[idx];
@@ -285,13 +284,13 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
                 id = cx.derive_id(short.to_owned()),
                 name = name
             );
-            item_table_nth_element = 0;
         }
 
         match *myitem.kind {
             clean::ExternCrateItem { ref src } => {
                 use crate::html::format::anchor;
 
+                w.write_str(ITEM_TABLE_ROW_OPEN);
                 match *src {
                     Some(ref src) => write!(
                         w,
@@ -312,6 +311,7 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
                     ),
                 }
                 w.write_str("</code></div>");
+                w.write_str(ITEM_TABLE_ROW_CLOSE);
             }
 
             clean::ImportItem(ref import) => {
@@ -336,6 +336,7 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
 
                 let add = if stab.is_some() { " " } else { "" };
 
+                w.write_str(ITEM_TABLE_ROW_OPEN);
                 write!(
                     w,
                     "<div class=\"item-left {stab}{add}import-item\">\
@@ -348,6 +349,7 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
                     imp = import.print(cx),
                     stab_tags = stab_tags.unwrap_or_default(),
                 );
+                w.write_str(ITEM_TABLE_ROW_CLOSE);
             }
 
             _ => {
@@ -368,6 +370,7 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
                 let add = if stab.is_some() { " " } else { "" };
 
                 let doc_value = myitem.doc_value().unwrap_or_default();
+                w.write_str(ITEM_TABLE_ROW_OPEN);
                 write!(
                     w,
                     "<div class=\"item-left {stab}{add}module-item\">\
@@ -390,15 +393,9 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
                         .collect::<Vec<_>>()
                         .join(" "),
                 );
+                w.write_str(ITEM_TABLE_ROW_CLOSE);
             }
         }
-
-        item_table_nth_element += 1;
-        if item_table_nth_element > item_table_block_size {
-            w.write_str(ITEM_TABLE_CLOSE);
-            w.write_str(ITEM_TABLE_OPEN);
-            item_table_nth_element = 0;
-        }
     }
 
     if curty.is_some() {
diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index eb7cc9309f4..341d9b80fd8 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -773,22 +773,18 @@ h2.small-section-header > .anchor {
 .block a.current.crate { font-weight: 500; }
 
 .item-table {
-	display: grid;
-	column-gap: 1.2rem;
-	row-gap: 0.0rem;
-	grid-template-columns: auto 1fr;
+	display: table-row;
 	/* align content left */
 	justify-items: start;
 }
-
+.item-row {
+	display: table-row;
+}
 .item-left, .item-right {
-	display: block;
+	display: table-cell;
 }
 .item-left {
-	grid-column: 1;
-}
-.item-right {
-	grid-column: 2;
+	padding-right: 1.2rem;
 }
 
 .search-container {
@@ -1891,6 +1887,9 @@ details.undocumented[open] > summary::before {
 
 	/* Display an alternating layout on tablets and phones */
 	.item-table {
+		display: block;
+	}
+	.item-row {
 		display: flex;
 		flex-flow: column wrap;
 	}
diff --git a/src/test/rustdoc-gui/huge-collection-of-constants.goml b/src/test/rustdoc-gui/huge-collection-of-constants.goml
new file mode 100644
index 00000000000..924fab1ea91
--- /dev/null
+++ b/src/test/rustdoc-gui/huge-collection-of-constants.goml
@@ -0,0 +1,5 @@
+goto: file://|DOC_PATH|/test_docs/huge_amount_of_consts/index.html
+
+// Make sure that the last two entries are more than 12 pixels apart and not stacked on each other.
+
+compare-elements-position-near-false: ("//*[@class='item-table']//div[last()-1]", "//*[@class='item-table']//div[last()-3]", {"y": 12})
diff --git a/src/test/rustdoc-gui/src/test_docs/Cargo.toml b/src/test/rustdoc-gui/src/test_docs/Cargo.toml
index 7f3c65746fc..5f527078e79 100644
--- a/src/test/rustdoc-gui/src/test_docs/Cargo.toml
+++ b/src/test/rustdoc-gui/src/test_docs/Cargo.toml
@@ -3,5 +3,7 @@ name = "test_docs"
 version = "0.1.0"
 edition = "2018"
 
+build = "build.rs"
+
 [lib]
 path = "lib.rs"
diff --git a/src/test/rustdoc-gui/src/test_docs/build.rs b/src/test/rustdoc-gui/src/test_docs/build.rs
new file mode 100644
index 00000000000..16c96ded912
--- /dev/null
+++ b/src/test/rustdoc-gui/src/test_docs/build.rs
@@ -0,0 +1,15 @@
+//! generate 2000 constants for testing
+
+use std::{fs::write, path::PathBuf};
+
+fn main() -> std::io::Result<()> {
+    let out_dir = std::env::var("OUT_DIR").expect("OUT_DIR is not defined");
+
+    let mut output = String::new();
+    for i in 0..2000 {
+        let line = format!("/// Some const A{0}\npub const A{0}: isize = 0;\n", i);
+        output.push_str(&*line);
+    };
+
+    write(&[&*out_dir, "huge_amount_of_consts.rs"].iter().collect::<PathBuf>(), output)
+}
diff --git a/src/test/rustdoc-gui/src/test_docs/lib.rs b/src/test/rustdoc-gui/src/test_docs/lib.rs
index af4f28047fc..0aa1426a36a 100644
--- a/src/test/rustdoc-gui/src/test_docs/lib.rs
+++ b/src/test/rustdoc-gui/src/test_docs/lib.rs
@@ -116,3 +116,7 @@ pub mod keyword {}
 
 /// Just some type alias.
 pub type SomeType = u32;
+
+pub mod huge_amount_of_consts {
+    include!(concat!(env!("OUT_DIR"), "/huge_amount_of_consts.rs"));
+}
diff --git a/src/tools/rustdoc-gui/tester.js b/src/tools/rustdoc-gui/tester.js
index d34dcc0f094..b598c63f52a 100644
--- a/src/tools/rustdoc-gui/tester.js
+++ b/src/tools/rustdoc-gui/tester.js
@@ -172,7 +172,7 @@ async function main(argv) {
     }
     files.sort();
 
-    console.log(`Running ${files.length} rustdoc-gui tests...`);
+    console.log(`Running ${files.length} rustdoc-gui (${opts["jobs"]} concurrently) ...`);
 
     if (opts["jobs"] < 1) {
         process.setMaxListeners(files.length + 1);