FIX: Un-revert the btn class added to the topic post menu

app/assets/javascripts/discourse/widgets/button.js.es6

@@ -78,5 +78,5 @@ export const ButtonClass = {
 export default createWidget('button', ButtonClass);
 
 createWidget('flat-button', jQuery.extend(ButtonClass, {
-  tagName: 'button.widget-button.btn-flat'
+  tagName: 'button.widget-button.btn.btn-flat'
 }));

app/assets/stylesheets/desktop/topic-post.scss

@@ -119,6 +119,11 @@ nav.post-controls {
     margin-right: 5px;
   }
 
+  .btn:disabled {
+    background: transparent;
+    cursor: default;
+  }
+
   button {
     font-size: 1.143em;
     padding: 8px 10px;
@@ -127,7 +132,7 @@ nav.post-controls {
     border: none;
     margin-left: 3px;
 
-    &.d-hover {
+    &.d-hover, &:hover {
       background: $primary-low;
       color: $primary;
     }