# Merge pull request \#1664 from zed-industries/slow-undo · gitcafe/zed

[View on GitCafe](https://git.cafe/gitcafe/zed/commit/8fc12b0bf094ddbd942a3b04b39e816b051fd56f)

Repository: [gitcafe/zed](https://git.cafe/gitcafe/zed)

Visibility: public

Requested revision: 8fc12b0bf094ddbd942a3b04b39e816b051fd56f

Requested commit: 8fc12b0bf094ddbd942a3b04b39e816b051fd56f

Commit: 8fc12b0bf094ddbd942a3b04b39e816b051fd56f

Tree: b04568d741b7c539a3f48422e778ff89063b241a

Author: Antonio Scandurra

Committer: GitHub

## Message

```
Merge pull request #1664 from zed-industries/slow-undo

Use a `SumTree` as the backing storage of `UndoMap`
```

## Parents

- [5bfd03a1805c46ab6e4bf9e6869715927d58e322](https://git.cafe/gitcafe/zed/commit/5bfd03a1805c46ab6e4bf9e6869715927d58e322?format=markdown)

- [f54c1f05c59ef5902be221095a4dafd800c7b985](https://git.cafe/gitcafe/zed/commit/f54c1f05c59ef5902be221095a4dafd800c7b985?format=markdown)

[Source at this commit](https://git.cafe/gitcafe/zed/tree/8fc12b0bf094ddbd942a3b04b39e816b051fd56f?format=markdown)