Guake quake-style terminal window drifts downward each time it's opened

This bug is affecting manjaro users of Guake after a system update in July/August.

https://github.com/Guake/guake/issues/2184

I’m sorry, but I have no problem at all with Guake on Manjaro.
The main difference is that I’m using XFCE and this problem is probably specific to i3wm.