id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1217566173,I_kwDOAMm_X85IkpXd,6528,cumsum drops index coordinates,2448579,open,0,,,5,2022-04-27T16:04:08Z,2023-09-22T07:55:56Z,,MEMBER,,,,"### What happened?

cumsum drops index coordinates. Seen in #6525, #3417

### What did you expect to happen?

Preserve index coordinates

### Minimal Complete Verifiable Example

```Python
import xarray as xr

ds = xr.Dataset(
        {""foo"": ((""x"",), [7, 3, 1, 1, 1, 1, 1])},
        coords={""x"": [0, 1, 2, 3, 4, 5, 6]},
    )
ds.cumsum(""x"")
```

```
<xarray.Dataset>
Dimensions:  (x: 7)
Dimensions without coordinates: x
Data variables:
    foo      (x) int64 7 10 11 12 13 14 15
```


### Relevant log output

_No response_

### Anything else we need to know?

_No response_

### Environment

<details>

xarray main

</details>
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/6528/reactions"", ""total_count"": 3, ""+1"": 3, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,issue
1217509109,PR_kwDOAMm_X8424hSf,6525,Add cumsum to DatasetGroupBy,2448579,closed,0,,,3,2022-04-27T15:19:20Z,2022-07-20T01:31:41Z,2022-07-20T01:31:37Z,MEMBER,,0,pydata/xarray/pulls/6525,"- [x] Closes #3141, Closes #3417
- [x] Tests added
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [x] New functions/methods are listed in `api.rst`
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/6525/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull