Fix focus state in preview tab

Adds MR ID to changelog entry

Removes changelog entry

Fixes after review

app/assets/stylesheets/framework/markdown_area.scss

@@ -64,12 +64,17 @@
 
     a {
       padding-top: 0;
-      line-height: 1;
+      line-height: 19px;
       border-bottom: 1px solid $border-color;
 
       &.btn.btn-xs {
         padding: 2px 5px;
       }
+
+      &:focus {
+        margin-top: -10px;
+        padding-top: 10px;
+      }
     }
   }
 }