DEV: flexify post-controls and stop relying on clearfix (#12098)

app/assets/javascripts/discourse/app/widgets/post-menu.js

@@ -598,7 +598,7 @@ export default createWidget("post-menu", {
 
     const contents = [
       h(
-        "nav.post-controls.clearfix" +
+        "nav.post-controls" +
           (this.state.collapsed ? ".collapsed" : ".expanded") +
           (siteSettings.enable_filtered_replies_view
             ? ".replies-button-visible"

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

@@ -49,11 +49,15 @@ section.post-menu-area {
 
 nav.post-controls {
   padding: 0;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
 
   .actions {
     text-align: right;
-    float: right;
     display: inline-block;
+    margin-left: auto;
+
     .more-actions {
       display: none;
       overflow: hidden;