and also things like the unsent message error and encryption
warning.
Stuff that we need to do at room view mount time had got moved into
a clause of the if statement in onHaveRoom and so wasn't being
executed.
Fixes https://github.com/vector-im/riot-web/issues/4327
If we successfully join, display a spinner until the js-sdk indicates (via room membership event or room event) that we can start using the room normally. A room event indicates we have never seen that room which means we need to use the new room object to clobber state.room. This is to make sure we replace the room that is set up for peeking with the room that can be used normally. For historical rooms, this isn't a problem.
This is a workaround for the fact that when peeking, the js-sdk calls onRoom, which is difficult to handle from the clients perspective because onRoom should only be called for rooms that you've never seen before. But if you peek a room that you've joined and left and get an onRoom, you run into trouble. You also can't just always use onRoomMembership because this won't be triggered for the first time you see the room. So we end up using a combination of both.
See https://github.com/matrix-org/matrix-js-sdk/issues/464 for discussion on improving this
Fix for https://github.com/vector-im/riot-web/issues/4224
Due to the way `MatrixChat` does a state update when the `view_room` dispatch fires and a second update when `RoomViewStore` sends an update, the current event ID and room ID were becoming out of sync. The solution devised was to have the event ID managed by the `RoomViewStore` itself and do any defaulting there (for when we revisit a room that we saved scroll state for previously).
This required a few changes:
- The addition of `update_scroll_state` in `RoomViewStore` allows the `RoomView` to save scroll state for a room before swapping to another one. Previously the caching of scroll state was done in `RoomView`.
- The `view_room` dispatch now accepts an `event_id`, which dictates which event is supposed to be scrolled to in the `MessagePanel` when a new room is viewed. It also accepts `event_offset`, but currently, this isn't passed in by a dispatch in the app, but it is clobbered when loading the default position when an `event_id` isn't specified. Finally, `highlighted` was added to distinguish whether the initial event being scrolled to is also highlighted. This flag is also used by `viewRoom` in `MatrixChat` in order to decide whether to `notifyNewScreen` with the specified `event_id`.
Dispatch so we can set the state in RoomViewStore. Show the error
when the room join fails (unsure if it's better to do this from
the component or the store). Remove unused joinError from roomview.
