Remove margin between buttons in button groups; use border-radius mixins to...

Remove margin between buttons in button groups; use border-radius mixins to avoid reseting border-radii that don't need resetting

docs/assets/css/bootstrap.css

@@ -3494,10 +3494,6 @@ button.close {
   border-radius: 0;
 }
 
-.btn-group > .btn + .btn {
-  margin-left: 1px;
-}
-
 .btn-group > .btn:first-child {
   margin-left: 0;
   border-bottom-left-radius: 4px;
@@ -3567,25 +3563,24 @@ button.close {
   border-radius: 0;
 }
 
-.btn-group-vertical > .btn + .btn {
-  margin-top: 1px;
-  margin-left: 0;
-}
-
 .btn-group-vertical .btn:first-child {
-  border-radius: 4px 4px 0 0;
+  border-top-right-radius: 4px;
+  border-top-left-radius: 4px;
 }
 
 .btn-group-vertical .btn:last-child {
-  border-radius: 0 0 4px 4px;
+  border-bottom-right-radius: 4px;
+  border-bottom-left-radius: 4px;
 }
 
 .btn-group-vertical .btn-large:first-child {
-  border-radius: 6px 6px 0 0;
+  border-top-right-radius: 6px;
+  border-top-left-radius: 6px;
 }
 
 .btn-group-vertical .btn-large:last-child {
-  border-radius: 0 0 6px 6px;
+  border-bottom-right-radius: 6px;
+  border-bottom-left-radius: 6px;
 }
 
 .btn-group-justified {

less/button-groups.less

@@ -41,32 +41,26 @@
   position: relative;
   border-radius: 0;
 }
-.btn-group > .btn + .btn {
-  margin-left: 1px;
-}
+
 
 // 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-top-left-radius: @border-radius-base;
-  border-bottom-left-radius: @border-radius-base;
+  .border-left-radius(@border-radius-base);
 }
 // 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-top-right-radius: @border-radius-base;
-  border-bottom-right-radius: @border-radius-base;
+  .border-right-radius(@border-radius-base);
 }
 // Reset corners for large buttons
 .btn-group > .btn.large:first-child {
   margin-left: 0;
-  border-top-left-radius: @border-radius-large;
-  border-bottom-left-radius: @border-radius-large;
+  .border-left-radius(@border-radius-large);
 }
 .btn-group > .btn.large:last-child,
 .btn-group > .large.dropdown-toggle {
-  border-top-right-radius: @border-radius-large;
-  border-bottom-right-radius: @border-radius-large;
+  .border-right-radius(@border-radius-large);
 }
 
 // On active and open, don't show outline
@@ -119,29 +113,23 @@
 // Vertical button groups
 // ----------------------
 
-.btn-group-vertical {
-}
 .btn-group-vertical > .btn {
   display: block;
   float: none;
   border-radius: 0;
   max-width: 100%;
 }
-.btn-group-vertical > .btn + .btn {
-  margin-left: 0;
-  margin-top: 1px;
-}
 .btn-group-vertical .btn:first-child {
-  border-radius: @border-radius-base @border-radius-base 0 0;
+  .border-top-radius(@border-radius-base);
 }
 .btn-group-vertical .btn:last-child {
-  border-radius: 0 0 @border-radius-base @border-radius-base;
+  .border-bottom-radius(@border-radius-base);
 }
 .btn-group-vertical .btn-large:first-child {
-  border-radius: @border-radius-large @border-radius-large 0 0;
+  .border-top-radius(@border-radius-large);
 }
 .btn-group-vertical .btn-large:last-child {
-  border-radius: 0 0 @border-radius-large @border-radius-large;
+  .border-bottom-radius(@border-radius-large);
 }