Rollup merge of #88776 - dns2utf8:rustdoc_workaround_1000_elements_grid_bug, r=GuillaumeGomez

Workaround blink/chromium grid layout limitation of 1000 rows

I made this in case we don't come up with a better solution in time.

See #88545 for more details.

A rendered version of the standard library is hosted here:
https://data.estada.ch/rustdoc-nightly_497ee321af_2021-09-09/core/arch/arm/index.html

r? `@GuillaumeGomez` `@jsha`

Author: Manishearth

src/librustdoc/html/render/print_item.rs

@@ -256,6 +256,10 @@ 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];
         if myitem.is_stripped() {
@@ -281,6 +285,7 @@ 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 {
@@ -387,6 +392,13 @@ fn item_module(w: &mut Buffer, cx: &Context<'_>, item: &clean::Item, items: &[cl
                 );
             }
         }
+
+        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() {