If the world is in focus and build button is pressed without the build floater open, don't bother focusing.
If a floater is in focus and build button is pressed without the build floater open, focus the build floater
If the build floater is in the background and the button is pressed, focus the build floater.
If the build floater is in focus and the button is pressed, close the build floater.
If the build floater is not in focus but nothing else is, close the build floater.
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