[docs-infra] Block than more feedback submissions (#46824)

Signed-off-by: Olivier Tassinari <oliviertassinari@users.noreply.github.com>
Co-authored-by: Jan Potoms <2109932+Janpot@users.noreply.github.com>

Author: oliviertassinari

docs/src/modules/components/AppLayoutDocsFooter.js

@@ -336,6 +336,13 @@ export default function AppLayoutDocsFooter(props) {
 
   const handleSubmitComment = (event) => {
     event.preventDefault();
+    // Block more than one submission.
+    // Technically, setState() is async in React, so a ninja user could still
+    // manage to trigger a double form submission. Still, let's wait and see
+    // before adding the overhead of a React ref to solve this.
+    if (!commentOpen) {
+      return;
+    }
     setCommentOpen(false);
     processFeedback();
   };