FIX: Buggy jump-to-post on Firefox (#16153)

app/assets/javascripts/discourse/app/components/d-modal.js

@@ -158,6 +158,7 @@ export default Component.extend({
     }
     if (event.key === "Enter" && this.triggerClickOnEnter(event)) {
       this.element?.querySelector(".modal-footer .btn-primary")?.click();
+      event.preventDefault();
     }
     if (event.key === "Tab") {
       this._trapTab(event);

app/assets/javascripts/discourse/app/templates/modal/jump-to-post.hbs

@@ -3,7 +3,13 @@
   <div class="jump-to-post-form">
     <div class="jump-to-post-control">
       <span class="index">#</span>
-      {{input id="post-jump" type="number" value=postNumber insert-newline=(action "jump")}}
+      {{input
+        id="post-jump"
+        type="number"
+        value=postNumber
+        insert-newline=(action "jump")
+        autofocus="true"
+      }}
       <span class="input-hint-text post-number">
         {{i18n "topic.progress.jump_prompt_of" count=filteredPostsCount}}
       </span>