prevent line number from being copied in chrome

Author: el-ev

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

@@ -2248,9 +2248,17 @@ function preLoadCss(cssUrl) {
         if (!isInsideCode) {
             return;
         }
-        const selection = document.getSelection();
-         // @ts-expect-error
-        nonnull(event.clipboardData).setData("text/plain", selection.toString());
+        // On Chrome, the line numbers are copied when copying from a code block.
+        // Remove them from the selection.
+        //
+        // Issue: https://github.com/rust-lang/rust/issues/146816
+        const selection = nonnull(document.getSelection());
+        const text = Array.from({ length: selection.rangeCount }, (_, i) => {
+            const fragment = selection.getRangeAt(i).cloneContents();
+            fragment.querySelectorAll("[data-nosnippet]").forEach(el => el.remove());
+            return fragment.textContent;
+        }).join("");
+        nonnull(event.clipboardData).setData("text/plain", text);
         event.preventDefault();
     });
 }());