[Xmonad] How to make mouse follow focus?

[Xiao-Yong Jin]

It would be easy to do selection and paste with the mouse if
it's near the window with focus.  Perhaps making the mouse
move to the upper right corner of the window, when every
time focus changes, is a good way to go?  If I understand it
correctly, I probably need to do something with the
layoutHooks?  Please help me to figure out how to achieve
this, thanks.

Xiao-Yong
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