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MSC3282: Expose enable_set_displayname in capabilities response #3282

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MSC3282: Expose enable_set_displayname in capabilities response #3282

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# MSC3279: Expose enable_set_displayname in capabilities response
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But now this is MSC3282



Some home servers like synapse can be configured to enable_set_displayname: false. To enable clients to handle that gracefully in the UI this setting should be exposed.

## Proposal

The `/_matrix/client/r0/capabilities` endpoint could be decorated to provide more information on capabilities.
```javascript
{
"capabilities": {
"m.enable_set_displayname": false,
"m.room_versions": {...},
}
}
```
As part of this MSC, a capability will be added that exposes the server setting:
`m.enable_set_displayname`

## Client recommendations
When presenting profile settings, clients should use capabilities in order to display the correct UI.
If capability is not present the default is true.

## Unstable prefix
Implementations won't actually be able to use m.enable_set_displayname until the MSC has finished the Final Comment Period. While the MSC is in review, implementations can use an unstable prefix (im.vector.enable_set_displayname) instead.