Ticket #28966: 28966.2.patch

src/wp-admin/css/forms.css

@@ -80 +80 @@
         float: left;
         display: inline-block;
         vertical-align: middle;
-        width: 16px;
         font: normal 21px/1 'dashicons';
         speak: none;
         -webkit-font-smoothing: antialiased;
@@ -93 +92 @@
         color: #1e8cbe;
 }
 
+.rtl input[type=checkbox]:checked:before {
+        -webkit-transform: rotateY(180deg);
+        -ms-transform: rotateY(180deg);
+        transform: rotateY(180deg);
+}
+
 input[type=radio]:checked:before {
         content: '\2022';
         text-indent: -9999px;