When I put my cursor over a stack of items in my inventory and press control-q the whole stack does not get dropped anymore.
My guess is that when Minecraft was updated to use OS X commands (Like ctrl-c is now cmd-c) ctrl-q became cmd-q. Command+q is the quit command, so all I can do is quit the game.
Please do not mark unreleased versions as affected.
You don't have access to them yet.
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