Stop Minecraft from exiting when hitting x button

[Mixu_78]

I'm trying to make a mod that pops up a little window for confirmation when you click the x button in the top-right corner, but I have no idea how to prevent minecraft from calling shutdown() when said button is pressed. I assume one would have to write a coremod to replace the shutdown function/change what minecraft calls when x button is pressed, but is there a way to do this without a coremod?

[DaemonUmbra]

Is accidentally hitting the little red X really an issue for you?

[Mixu_78]

Sometimes I launch up a big pack and go do other stuff while game loads in background, and occasionally some program decides to be slow with quitting and then when I'm going to press the x on slow program it decides to quit and then I hit the button on minecrafts window.