Pull request #1886: 无JIRA任务 新增一套hover-visible的原子化实现

Merge in VISUAL/fineui from ~DAILER/fineui:master to master

* commit 'efd3d7e9fefd95c67a51426926d61d7260784185':
  无JIRA任务 新增一套hover-visible的原子化实现

src/less/core/utils/common.less

@@ -493,3 +493,14 @@
     .background-color(@color-bi-background-black-theme-dark, 50%);
   }
 }
+
+// hover-visible的原子化形式
+.bi-hover-visible-container {
+  & .bi-hover-visible-item {
+    visibility: hidden;
+  }
+
+  &:hover .bi-hover-visible-item {
+    visibility: visible;
+  }
+}