add clearfix to control-group for longer labels and any other unforeseen circumstances

docs/assets/css/bootstrap.css

@@ -951,6 +951,14 @@ input:focus:required:invalid:focus, textarea:focus:required:invalid:focus, selec
 }
 .form-horizontal .control-group {
   margin-bottom: 18px;
+  *zoom: 1;
+}
+.form-horizontal .control-group:before, .form-horizontal .control-group:after {
+  display: table;
+  content: "";
+}
+.form-horizontal .control-group:after {
+  clear: both;
 }
 .form-horizontal .control-group > label {
   float: left;

less/forms.less

@@ -505,6 +505,7 @@ select:focus:required:invalid {
   // Increase spacing between groups
   .control-group {
     margin-bottom: @baseLineHeight;
+    .clearfix();
   }
   // Float the labels left
   .control-group > label {