Joren Van Onder
7318ab6710
When quickly changing the range in the calendar view, multiple asynchronous read_slice requests will be launched. The read_slice returns the records and sets the ids property on the dataset according to a set domain, context etc. This creates a race condition because although the read_slice calls will be launched in the correct order, there is no guarantee that they will resolve in the correct order. In practice issues will occur quite frequently on a slower connection and with a big read followed by a small read. The big read that matches a lot of records will be slower to complete than the small read which will result in it resolving later than the small read. This causes the dataset to not be in sync with the rest of the view. When you click on an affected event everything will look fine in the popup, but when clicking on edit the form view will show a new event instead. The reason for this is that switching to the form view requires a correct dataset.index, which is set by dataset.get_id_index(id) which won't exist. A potential way of fixing this would be guaranteeing the order of read_slice calls by only allowing one of them to be active at a time. This would not be ideal because you could end up with a long chain of read_slice calls when changing the range fast on a slow connection. In theory the UI would have to block as well then. Instead of that, we will simply ignore responses to out-of-date requests. This is done by manually resetting the ids property of the dataset to its previous value when we detect the range of the calendar has changed since the read_slice call was launched. opw-673425
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