补充注释

src/less/core/utils/common.less

@@ -45,6 +45,7 @@ textarea {
   &:focus, &:hover {
     border-color: @color-bi-border-highlight;
   }
+  // ie下不支持focus-within， 和上面写在一起会导致ie下:hover不生效
   &:focus-within{
     border-color: @color-bi-border-highlight;
   }