1. Join a server through the server browser
2. desire to abort the process of joining the server
3. we are unable to stop

I was motivated to make this because I was testing out some stuff in experimental,
I tried to setup a test server, but I coudln't connect to it,
because the server was wrongly configured, I was stuck in the loading screen without an ability to exit it in-game,
the fastest solution was to restart my game

The faster we get this feature, the more time we save in combination with all the players who wish to stop joining a server.
Some of these players are making servers or mods and their time could be spent on doing more fun things.