undo redo bug

[zhangbo87]

Describe the bug
你好这个撤销和重做测试下来还是有bug比如移动画布上的一个元素就会存在撤销不了的情况



To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[zhangbo87]

我删掉，再撤销，再删除，然后再撤销就出不来了

[nihaojob]

可以参考下 大佬的 PR #521 对错误进行了修正，后边会合并到分支。

[nihaojob]

#521 已合并到主分支