Update button groups to use not selector and remove redundant CSS.

docs/assets/css/bootstrap.css

@@ -3830,26 +3830,30 @@ button.close {
   border-bottom-color: #ffffff;
 }
 
-.btn-group {
+.btn-group,
+.btn-group-vertical {
   position: relative;
   display: inline-block;
   vertical-align: middle;
 }
 
-.btn-group > .btn {
+.btn-group > .btn,
+.btn-group-vertical > .btn {
   position: relative;
   float: left;
 }
 
-.btn-group > .btn + btn {
-  margin-left: -1px;
-}
-
 .btn-group > .btn:hover,
-.btn-group > .btn:active {
+.btn-group-vertical > .btn:hover,
+.btn-group > .btn:active,
+.btn-group-vertical > .btn:active {
   z-index: 2;
 }
 
+.btn-group .btn + .btn {
+  margin-left: -1px;
+}
+
 .btn-toolbar:before,
 .btn-toolbar:after {
   display: table;
@@ -3881,52 +3885,42 @@ button.close {
   margin-left: 5px;
 }
 
-.btn-group > .btn {
-  position: relative;
+.btn-group > .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {
   border-radius: 0;
 }
 
 .btn-group > .btn:first-child {
   margin-left: 0;
-  border-bottom-left-radius: 4px;
-  border-top-left-radius: 4px;
 }
 
-.btn-group > .btn:last-child,
-.btn-group > .dropdown-toggle {
-  border-top-right-radius: 4px;
-  border-bottom-right-radius: 4px;
-}
-
-.btn-group > .btn.large:first-child {
-  margin-left: 0;
-  border-bottom-left-radius: 6px;
-  border-top-left-radius: 6px;
+.btn-group > .btn:first-child:not(:last-child):not(.dropdown-toggle) {
+  border-top-right-radius: 0;
+  border-bottom-right-radius: 0;
 }
 
-.btn-group > .btn.large:last-child,
-.btn-group > .large.dropdown-toggle {
-  border-top-right-radius: 6px;
-  border-bottom-right-radius: 6px;
+.btn-group > .btn:last-child:not(:first-child),
+.btn-group > .dropdown-toggle:not(:first-child) {
+  border-bottom-left-radius: 0;
+  border-top-left-radius: 0;
 }
 
 .btn-group > .btn-group {
   float: left;
 }
 
-.btn-group > .btn-group > .btn {
+.btn-group > .btn-group:not(:first-child):not(:last-child) > .btn {
   border-radius: 0;
 }
 
-.btn-group > .btn-group:last-child > .btn {
-  border-top-right-radius: 4px;
-  border-bottom-right-radius: 4px;
+.btn-group > .btn-group:first-child > .btn:last-child,
+.btn-group > .btn-group:first-child > .dropdown-toggle {
+  border-top-right-radius: 0;
+  border-bottom-right-radius: 0;
 }
 
-.btn-group > .btn-group:first-child > .btn {
-  margin-left: 0;
-  border-bottom-left-radius: 4px;
-  border-top-left-radius: 4px;
+.btn-group > .btn-group:last-child > .btn:first-child {
+  border-bottom-left-radius: 0;
+  border-top-left-radius: 0;
 }
 
 .btn-group .dropdown-toggle:active,
@@ -3974,26 +3968,22 @@ button.close {
   max-width: 100%;
 }
 
-.btn-group-vertical .btn:first-child {
-  border-radius: 0;
-  border-top-right-radius: 4px;
-  border-top-left-radius: 4px;
+.btn-group-vertical > .btn + .btn {
+  margin-top: -1px;
 }
 
-.btn-group-vertical .btn:last-child {
+.btn-group-vertical .btn:not(:first-child):not(:last-child) {
   border-radius: 0;
-  border-bottom-right-radius: 4px;
-  border-bottom-left-radius: 4px;
 }
 
-.btn-group-vertical .btn-large:first-child {
-  border-top-right-radius: 6px;
-  border-top-left-radius: 6px;
+.btn-group-vertical .btn:first-child {
+  border-bottom-right-radius: 0;
+  border-bottom-left-radius: 0;
 }
 
-.btn-group-vertical .btn-large:last-child {
-  border-bottom-right-radius: 6px;
-  border-bottom-left-radius: 6px;
+.btn-group-vertical .btn:last-child {
+  border-top-right-radius: 0;
+  border-top-left-radius: 0;
 }
 
 .btn-group-justified {

docs/components.html

@@ -552,7 +552,7 @@ lead: "Dozens of reusable components built to provide iconography, dropdowns, na
     <h3 id="btn-groups-vertical">Vertical button groups</h3>
     <p>Make a set of buttons appear vertically stacked rather than horizontally.</p>
     <div class="bs-example">
-      <div class="btn-group btn-group-vertical">
+      <div class="btn-group-vertical">
         <button type="button" class="btn btn-default"><i class="glyphicon glyphicon-align-left"></i></button>
         <button type="button" class="btn btn-default"><i class="glyphicon glyphicon-align-center"></i></button>
         <button type="button" class="btn btn-default"><i class="glyphicon glyphicon-align-right"></i></button>
@@ -560,7 +560,7 @@ lead: "Dozens of reusable components built to provide iconography, dropdowns, na
       </div>
     </div>
 {% highlight html %}
-<div class="btn-group btn-group-vertical">
+<div class="btn-group-vertical">
   ...
 </div>
 {% endhighlight %}

less/button-groups.less

@@ -11,17 +11,14 @@
 }
 
 // Make the div behave like a button
-.btn-group {
+.btn-group,
+.btn-group-vertical {
   position: relative;
   display: inline-block;
   vertical-align: middle; // match .btn alignment given font-size hack above
   > .btn {
     position: relative;
     float: left;
-    // Prevent double borders when buttons are next to each other
-    + btn {
-      margin-left: -1px;
-    }
     // Bring the "active" button to the front
     &:hover,
     &:active {
@@ -30,6 +27,11 @@
   }
 }
 
+// Prevent double borders when buttons are next to each other
+.btn-group .btn + .btn {
+  margin-left: -1px;
+}
+
 // Optional: Group multiple button groups together for a toolbar
 .btn-toolbar {
   .clearfix();
@@ -46,46 +48,36 @@
   }
 }
 
-// Float them, remove border radius, then re-add to first and last elements
-.btn-group > .btn {
-  position: relative;
+.btn-group > .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {
   border-radius: 0;
 }
 
-
 // Set corners individual because sometimes a single button can be in a .btn-group and we need :first-child and :last-child to both match
 .btn-group > .btn:first-child {
   margin-left: 0;
-  .border-left-radius(@border-radius-base);
+  &:not(:last-child):not(.dropdown-toggle) {
+    .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,
-.btn-group > .dropdown-toggle {
-  .border-right-radius(@border-radius-base);
-}
-// Reset corners for large buttons
-.btn-group > .btn.large:first-child {
-  margin-left: 0;
-  .border-left-radius(@border-radius-large);
-}
-.btn-group > .btn.large:last-child,
-.btn-group > .large.dropdown-toggle {
-  .border-right-radius(@border-radius-large);
+.btn-group > .btn:last-child:not(:first-child),
+.btn-group > .dropdown-toggle:not(:first-child) {
+  .border-left-radius(0);
 }
 
 // Custom edits for including btn-groups within btn-groups (useful for including dropdown buttons within a btn-group)
 .btn-group > .btn-group {
   float: left;
 }
-.btn-group > .btn-group > .btn {
+.btn-group > .btn-group:not(:first-child):not(:last-child) > .btn {
   border-radius: 0;
 }
-.btn-group > .btn-group:last-child > .btn {
-  .border-right-radius(@border-radius-base);
+.btn-group > .btn-group:first-child > .btn:last-child,
+.btn-group > .btn-group:first-child > .dropdown-toggle {
+  .border-right-radius(0);
 }
-.btn-group > .btn-group:first-child > .btn {
-  margin-left: 0;
-  .border-left-radius(@border-radius-base);
+.btn-group > .btn-group:last-child > .btn:first-child {
+  .border-left-radius(0);
 }
 
 // On active and open, don't show outline
@@ -143,20 +135,18 @@
   float: none;
   width: 100%;
   max-width: 100%;
+  + .btn {
+    margin-top: -1px;
+  }
+}
+.btn-group-vertical .btn:not(:first-child):not(:last-child) {
+  border-radius: 0;
 }
 .btn-group-vertical .btn:first-child {
-  border-radius: 0; // Needs to be here for specificity since we're not zeroing them out again
-  .border-top-radius(@border-radius-base);
+  .border-bottom-radius(0);
 }
 .btn-group-vertical .btn:last-child {
-  border-radius: 0; // Needs to be here for specificity since we're not zeroing them out again
-  .border-bottom-radius(@border-radius-base);
-}
-.btn-group-vertical .btn-large:first-child {
-  .border-top-radius(@border-radius-large);
-}
-.btn-group-vertical .btn-large:last-child {
-  .border-bottom-radius(@border-radius-large);
+  .border-top-radius(0);
 }