z-index fix for inline title edit

Author: awesomerobot

assets/stylesheets/modules/ai-helper/common/ai-helper.scss

@@ -245,7 +245,11 @@
   position: absolute;
   right: 0;
   top: 1px; // container border width
-  z-index: z("composer", "dropdown") + 1;
+  z-index: z("dropdown");
+
+  #reply-control & {
+    z-index: z("composer", "dropdown") + 1;
+  }
 }
 
 .ai-category-suggester-content,