button-groups.less in less-rails-bootstrap-3.2.0

- old
+ new

@@ -18,11 +18,11 @@
     &.active {
       z-index: 2;
     }
     &:focus {
       // Remove focus outline when dropdown JS adds it after closing the menu
-      outline: none;
+      outline: 0;
     }
   }
 }
 
 // Prevent double borders when buttons are next to each other
@@ -214,13 +214,27 @@
     width: 1%;
   }
   > .btn-group .btn {
     width: 100%;
   }
+
+  > .btn-group .dropdown-menu {
+    left: auto;
+  }
 }
 
 
 // Checkbox and radio options
+//
+// In order to support the browser's form validation feedback, powered by the
+// `required` attribute, we have to "hide" the inputs via `opacity`. We cannot
+// use `display: none;` or `visibility: hidden;` as that also hides the popover.
+// This way, we ensure a DOM element is visible to position the popover from.
+//
+// See https://github.com/twbs/bootstrap/pull/12794 for more.
+
 [data-toggle="buttons"] > .btn > input[type="radio"],
 [data-toggle="buttons"] > .btn > input[type="checkbox"] {
-  display: none;
+  position: absolute;
+  z-index: -1;
+  .opacity(0);
 }