修正bug：即时渲染模式 输入 ``` 后会弹出 hint，此时执行 undo 后， hint 不消失#647
Merged
Vanessa219 merged 5 commits intoVanessa219:devfrom zTree:fixAutoHideHintAfterUndoJul 29, 2020
+2
Commits
Commits on Jul 14, 2020
- authored
zTree
Commits on Jul 17, 2020
- authoredzTree
Commits on Jul 20, 2020
- authoredzTree
Commits on Jul 29, 2020
- authoredzTree
- committedzTreeAPI