Basically the titles of this post.
Possibly change the setting in the application's preferences.
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and post some more information so we can see what's really going on. Now we know the symptom of the disease, but we need some more probing to know where the origin lies...
P.S. If you enter a bit more details in your profile, we can also see which Desktop Environment you're using, which CPU/GPU you have, ...
Manjaro XFCE. I run Minecraft with this command: java -jar /home/User/Desktop/Mineshafter-launcher.jar
Pressing the left Alt button while jumping launches a menu.
Try editing the keyboard shortcut in Settings>Window Manager>Keyboard>Window operations menu
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