There are a few ways for `connect()` to finish:
- `Browser.close()` from the client side.
- Browser on the server side did exit (e.g. crashed).
- Connection was dropped by either of the sides.
We reduce all the cases to the last one by dropping the
connection when client wants calls `Browser.close()` or
server-side browser exits.
In all these cases we should properly cleanup on the server side,
and ensure that all promises reject on the client side.
On a slow page that does a lot of things before navigating upon click,
it is common to move mouse away from the click point. Previously,
we would commit the click action and record a `page.goto()` for the
navigation. Now we attribute any signals, even after accidental mouse move,
to the previous action, in the 5-seconds time window.
We await the predicate now. For synchronous predicates,
nothing should change becase the await will finish before
the next protocol message arrives (thanks to `makeWaitForNextTask`).
Since check/uncheck does click under the hood, sometimes it might
need to click at a different position. One example would be a long
label that contains links inside, and clicking in the center happens
to hit the link instead of the label itself.
This changes the root object from RemoteBrowser to Playwright,
similar to local driver connection. This way, any remote connection
gets a Playwright object.
This also starts reusing PlaywrightServer class, and introduces
`cli run-server` hidden command that runs ws server on the
specified port.
Previous structure:
```
RemoteBrowser
- browser (using ConnectedBrowser for remote-specific behavior)
- selectors (special instance for this remote connection)
```
New structure:
```
Playwright
- ...
- selectors (special instance for this remote connection)
- preLaunchedBrowser (using ConnectedBrowser for remote-specific behavior)
```
This makes it much nicer to use `BrowserType` because it no longer has a template.
Technically a breaking change because of the rare edge case where someone used their own non-browser type inside the template, but I don't consider that intended behavior and think this is fine.
