The Minecraft launcher doesn't close after launching the game, even when the close button has been pressed. /me thinks this is due to a failure to insert JFrame.EXIT_ON_CLOSE somewhere but hey what do I know.
This is most likely causing the issues that people have been reporting where their computer is getting clogged with javaw processes, as the launcher stays open in the background despite the JFrame being closed.
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To add some detail here, on Mac/Ubuntu the icon of the launcher stays in the Dock/Launcher and doesn't go away even when the window is closed.
.. but only after launching the game ? If not launching the game and closing the launcher it closes ? (What did I write ?)
If you don't start the game but click on close of the launcher, it closes ?
My bad, looks like it does indeed quit once Minecraft has been quit. (and yes, only after Minecraft has been launched)
The problem with this however, is that the launcher hangs around in the background whilst playing even if the window is closed and on less capable machines can even cause lag.
Cannot confirm under Windows.