Fix last level indentation

Author: lycHub

.github/workflows/main.yml

@@ -3,6 +3,8 @@ on:
   push:
     branches:
       - master
+    tags:
+      - 'v*'
 jobs:
   build-and-deploy:
     runs-on: ubuntu-latest

src/components/VirtualTree/index.scss

@@ -19,6 +19,7 @@
         display: inline-block;
         margin-right: 4px;
         cursor: pointer;
+        min-width: 16px;
         .iconfont {
           display: block;
         }