Updates properties (set/remove) on the provided uri, or, in case it's null, on the URI
defined in associated Source, with the changes.
The order of changes is significant, unlike on other places.
This function supports only flat properties, those not under other element. To support more complex property tries use proppatch_sync directly.
| this | |
| uri |
URI to issue the request for, or null to read from Source |
| changes |
a SList with request changes |
| cancellable |
optional Cancellable object, or null |
|
Whether succeeded. |