bootstrap 3.2 upgrade

public/css/lib/bootstrap/button-groups.less

@@ -20,7 +20,7 @@
     }
     &:focus {
       // Remove focus outline when dropdown JS adds it after closing the menu
-      outline: none;
+      outline: 0;
     }
   }
 }
@@ -38,8 +38,7 @@
 // Optional: Group multiple button groups together for a toolbar
 .btn-toolbar {
   margin-left: -5px; // Offset the first child's margin
-  &:extend(.clearfix all)
-;
+  &:extend(.clearfix all);
 
   .btn-group,
   .input-group {
@@ -63,7 +62,6 @@
     .border-right-radius(0);
   }
 }
-
 // Need .dropdown-toggle since :last-child doesn't apply given a .dropdown-menu immediately after it
 .btn-group > .btn:last-child:not(:first-child),
 .btn-group > .dropdown-toggle:not(:first-child) {
@@ -74,18 +72,15 @@
 .btn-group > .btn-group {
   float: left;
 }
-
 .btn-group > .btn-group:not(:first-child):not(:last-child) > .btn {
   border-radius: 0;
 }
-
 .btn-group > .btn-group:first-child {
   > .btn:last-child,
   > .dropdown-toggle {
     .border-right-radius(0);
   }
 }
-
 .btn-group > .btn-group:last-child > .btn:first-child {
   .border-left-radius(0);
 }
@@ -96,24 +91,15 @@
   outline: 0;
 }
 
+
 // Sizing
 //
 // Remix the default button sizing classes into new ones for easier manipulation.
 
-.btn-group-xs > .btn {
-  &:extend(.btn-xs)
-;
-}
+.btn-group-xs > .btn { &:extend(.btn-xs); }
+.btn-group-sm > .btn { &:extend(.btn-sm); }
+.btn-group-lg > .btn { &:extend(.btn-lg); }
 
-.btn-group-sm > .btn {
-  &:extend(.btn-sm)
-;
-}
-
-.btn-group-lg > .btn {
-  &:extend(.btn-lg)
-;
-}
 
 // Split button dropdowns
 // ----------------------
@@ -123,7 +109,6 @@
   padding-left: 8px;
   padding-right: 8px;
 }
-
 .btn-group > .btn-lg + .dropdown-toggle {
   padding-left: 12px;
   padding-right: 12px;
@@ -132,7 +117,7 @@
 // The clickable button for toggling the menu
 // Remove the gradient and set the same inset shadow as the :active state
 .btn-group.open .dropdown-toggle {
-  .box-shadow(inset 0 3px 5px rgba(0, 0, 0, .125));
+  .box-shadow(inset 0 3px 5px rgba(0,0,0,.125));
 
   // Show no shadow for `.btn-link` since it has no other button styles.
   &.btn-link {
@@ -140,22 +125,22 @@
   }
 }
 
+
 // Reposition the caret
 .btn .caret {
   margin-left: 0;
 }
-
 // Carets in other button sizes
 .btn-lg .caret {
   border-width: @caret-width-large @caret-width-large 0;
   border-bottom-width: 0;
 }
-
 // Upside down carets for .dropup
 .dropup .btn-lg .caret {
   border-width: 0 @caret-width-large @caret-width-large;
 }
 
+
 // Vertical button groups
 // ----------------------
 
@@ -171,8 +156,7 @@
 
   // Clear floats so dropdown menus can be properly placed
   > .btn-group {
-    &:extend(.clearfix all)
-  ;
+    &:extend(.clearfix all);
     > .btn {
       float: none;
     }
@@ -200,22 +184,21 @@
     .border-top-radius(0);
   }
 }
-
 .btn-group-vertical > .btn-group:not(:first-child):not(:last-child) > .btn {
   border-radius: 0;
 }
-
 .btn-group-vertical > .btn-group:first-child:not(:last-child) {
   > .btn:last-child,
   > .dropdown-toggle {
     .border-bottom-radius(0);
   }
 }
-
 .btn-group-vertical > .btn-group:last-child:not(:first-child) > .btn:first-child {
   .border-top-radius(0);
 }
 
+
+
 // Justified button groups
 // ----------------------
 
@@ -233,10 +216,25 @@
   > .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);
 }