next.js

5c45d58c - Re-use randomly selected dev server port for automatic restarts (#72771)

Re-use randomly selected dev server port for automatic restarts (#72771) When `next dev` is started with `-p 0` or `PORT=0` – which is probably unusual in userland, but is the default for our tests – a random port is selected for the dev server. If the user, after starting the dev server, then changes the `next.config.js` file, the dev server detects that and automatically restarts. For the restart, the original port config is used, resulting in a random port being selected again. This will most likely be a different port than was selected before, and so reloads in the browser won't work. It also results in `ERR_CONNECTION_REFUSED` errors in our tests that use `patchFile` to change the `next.config.js` content. To fix that issue, we're now storing the automatically selected port when the dev server has started initially, and are re-using it for any subsequent automatic restarts.