Issue report: Steam doesn't close when I ask it to
I want to move Steam's files to a bigger filesystem, so I want to close steam, move the files and put in a symlink. I hit the X, and started moving things around and noticed that Steam was still running - that's not good. So I hit X again and it appears to close - but it still appears in my Alt-Tab menu, so I try and fail again. In the end I right-click from the task bar and close it there.
Apps not closing when they're told to close is not expected behaviour unless I've explicitly configured it so and as indicated by this example can be dangerous. There's also appears to be no configuration option for this behaviour. Please disable this behaviour and make it opt-in if you absolutely must have it.