Merge branch '0.8.0' into lesslint

style/components/collapse.less

@@ -51,8 +51,8 @@
     background-color: #fff;
 
     & > &-box {
-      margin-top: 16px;
-      margin-bottom: 16px;
+      padding-top: 16px;
+      padding-bottom: 16px;
     }
   }
 

style/components/form.less

@@ -230,6 +230,10 @@ form {
     vertical-align: middle;
   }
 
+  .@{prefixCalendarClass}-picker-input {
+    width: 100%!important;
+  }
+
   .@{css-prefix}form-text {
     display: inline-block;
   }

style/components/inputNumber.less

@@ -143,9 +143,10 @@
     cursor: pointer;
     &-inner {
       top: 1px;
+      .ie-rotate(2);
       &:before {
+        text-align: center;
         content: "\e600";
-        .ie-rotate(2);
         transform: rotate(180deg);
         -webkit-transform-origin: 47.5% 51%; /* fix chrome position */
       }
@@ -156,6 +157,7 @@
     cursor: pointer;
     &-inner {
       &:before {
+        text-align: center;
         content: "\e600";
       }
     }