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
1658291950,I_kwDOAMm_X85i14bu,7737,align ignores `copy`,2448579,open,0,,,2,2023-04-07T02:54:00Z,2023-06-20T23:07:56Z,,MEMBER,,,,"### Is your feature request related to a problem?

cc @benbovy 

xref #7730 

``` python
import numpy as np
import xarray as xr

arr = np.random.randn(10, 10, 365*30)
time = xr.date_range(""2000"", periods=30*365, calendar=""noleap"")
da = xr.DataArray(arr, dims=(""y"", ""x"", ""time""), coords={""time"": time})
year = da[""time.year""]
```

```python
xr.align(da, year, join=""outer"", copy=False)
```
This should result in no copies, but does

<img width=""1080"" alt=""image"" src=""https://user-images.githubusercontent.com/2448579/230531564-678da967-4f3b-497a-a5d5-8b464bbf2cbe.png"">


### Describe the solution you'd like

I think we need to check `aligner.copy` and/or `aligner.reindex` (maybe?) before copying here

https://github.com/pydata/xarray/blob/f8127fc9ad24fe8b41cce9f891ab2c98eb2c679a/xarray/core/dataset.py#L2805-L2818


### Describe alternatives you've considered

_No response_

### Additional context

_No response_","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/7737/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,issue