Merge pull request #1181 in VISUAL/fineui from ~GUYI/fineui:master to master

* commit '7ecce13022bef40b84e07ec59f17cccaca4f9483':
  BI-54505 refactor：解决冲突
  BI-54505 feat：hover-hidden放到fineui中
  BI-49178 fix：修复叶子节点间距问题
  BI-49178 fix：修复叶子节点没有缩进的问题

src/less/visual.less

@@ -324,4 +324,15 @@
       visibility: visible;
     }
   }
+}
+
+.hover-hidden(@cls) {
+  & .@{cls} {
+    visibility: visible;
+  }
+  &:hover {
+    & .@{cls} {
+      visibility: hidden;
+    }
+  }
 }