update input-group styl

style/components/form.less

@@ -44,11 +44,16 @@ label {
   .input-with-icon();
 }
 
-//== Style for input-group
+//== Style for input-group: input with label, with button or dropdown...
 .@{css-prefix}input-group {
   .input-group(~"@{css-prefix}input"; @btnClass)
 }
 
+//== composed by several input
+.@{css-prefix}inputs {
+  .inputs(~"@{css-prefix}input");
+}
+
 // 表单下的输入框尺寸唯一: 大尺寸
 form {
   .has-feedback {

style/mixins/input.less

@@ -187,3 +187,17 @@
     margin-top: ~"-2px \9";
   }
 }
+
+.inputs(@inputClass) {
+  display: flex;
+  flex-direction: row;
+  
+  & > &-item {
+    flex: 0 1 auto;
+    padding-left: 8px;
+
+    &:first-child {
+      padding-left: 0;
+    }
+  }
+}