Specifically:
```
JS 2.1.1 (Linux 0.0.0) joining a room over federation should not get stuck at a spinner FAILED
Did not find exactly one match (found: 0) for componentType:function (props, context, updater) {
```
actually meant that the room directory wasn't displayed - probably because the dispatch `view_room_directory` ended up on another tick of the event loop, meaning that the directory wasn't displayedi. The fix attempted in ths commit is to use `this._setPage` instead to view the directory. This uses `setState` to set the screen to the directory, so I'm not entirely convinced this will solve the problem (as `setState` may also end up doing things on another tick.
and
```
JS 2.1.1 (Linux 0.0.0) loading: MatrixClient rehydrated from stored credentials: shows a room view if we followed a room link FAILED
MatrixChat still not ready after 5 tries
awaitRoomView@/home/travis/build/vector-im/riot-web/test/all-tests.js:201363:90
```
was happening probably because in the handler for the `sync` event in `MatrixChat` (around line 840), there was one case in which the `ready` state may not be true (causing all 5 attempts to fail), and this case relied on `starting_room_alias_payload`. This `starting_room_alias_payload` is now redundant because of `initialScreenAfterLogin`, which was added recently.
Fixes https://github.com/vector-im/riot-web/issues/3529. In the worst case, tsOfNewestEvent will return MAX_SAFE_INTEGER, instead of undefined, as may be the case of some events that were redacted and persisted in indexDB before changes were made to how events are redacted locally. (The important change is that events are now not stripped of their `origin_server_ts`).
Only zero the local notification count when we actually send a
read receipt, otherwise we cause a re-render of the RoomList every
time the user moves the cursor in the window, basically.
Use an action and force an update when zeroing the number of notifications in a room. This is better than waiting for a `render` to happen at some point. This will hopefully fix https://github.com/vector-im/riot-web/issues/3257
To prevent the login screen from flashing when refreshing the app, use some state to indicate that a login is in progress, and OR that with the existing `loading` boolean to show the `<Spinner>` instead of the default `<Login>`.
This might be too invasive, and a default spinner may be better.
The fact that we showed no feedback whilst submitting the captcha
response was causing confusion on slower connections where this
took a nontrivial amount of time.
Takes a new flag from the js-sdk that indicates whether the
request being made is a background request, presenting a spinner
appropriately.
Requires https://github.com/matrix-org/matrix-js-sdk/pull/396
_onLoadCompleted happens straight away because Lifecycle finishes loading the session instantly when registration parameters (client_secret etc.) are set.
