move .hidden to utilities; fixes #10997

dist/css/bootstrap.css

@@ -6528,6 +6528,11 @@ button.close {
   border: 0;
 }
 
+.hidden {
+  display: none !important;
+  visibility: hidden !important;
+}
+
 .affix {
   position: fixed;
 }
@@ -6536,11 +6541,6 @@ button.close {
   width: device-width;
 }
 
-.hidden {
-  display: none !important;
-  visibility: hidden !important;
-}
-
 .visible-xs,
 tr.visible-xs,
 th.visible-xs,

less/responsive-utilities.less

@@ -22,16 +22,6 @@
 }
 
 
-// Hide from screenreaders and browsers
-//
-// Credit: HTML5 Boilerplate
-
-.hidden {
-  display: none !important;
-  visibility: hidden !important;
-}
-
-
 // Visibility utilities
 
 .visible-xs {

less/utilities.less

@@ -38,6 +38,16 @@
 }
 
 
+// Hide from screenreaders and browsers
+//
+// Credit: HTML5 Boilerplate
+
+.hidden {
+  display: none !important;
+  visibility: hidden !important;
+}
+
+
 // For Affix plugin
 // -------------------------