[xmonad] How to handle a message once?

[Joachim Breitner]

Hi,

I’m adding more features to the EWMH interaction, but I noticed that
when I handle messages from the user in a LayoutModifier, I get the
message once per workspace. How do I prevent that, and what is the
desired way of handling global messages?

Greetings,
Joachim

-- 
Joachim Breitner
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