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When running any Java swing application (like intellij idea) on Ubuntu the double click speed is by default set to 200ms. If like me you find this anoying you can decrease the double click speed by taking the following steps

In your home directory create a file called .Xresources and add the following line

*multiClickTime: 400

Then from the commandline execute

xrdb ~/.Xresources

to make the changes take effect