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I can't send a notification with notify-send over ssh, even though I have no problem launching other GUI programs from the same ssh connection

The command I use is:

ssh -X user@remote "DISPLAY=:0.0 notify-send this is a test"

There's no problem when I launch other programs (Steam, GVim, etc) with this method.

In fact, notify-send works fine if I try to do it on the remote computer itself.

I'm trying to do this on an ArchLinux with libnotify 0.7.6

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