What does "CTRL + SHIFT + H" do in compiz?

I was trying to open Firefox's browser history with the shortcut key CTRL + SHIFT + H but instead of that I get this sort of diagram over my current window:

The most awkward part is that if I close this window, Compiz appears to crash.

So, what is the purpose of this "Diagram" and how can I disable it?

1 Answer

This is part of the Freely Transformable Windows plugin:

By using Shift+Ctrl+MouseLeft, you can do some, er, very interesting things:

That overlay is meant to help guide you when manipulating and transforming windows using the above method. Basically, it just gives you a bunch of axes to use so that you can align/work with things more precisely. Regrettably, like with most Compiz plugins, it's sort of fallen out of support and is kinda buggy.

If you don't want this feature, just launch the CompizConfig Settings Manager and disable that plugin. If you don't have CCSM, install it with apt:

sudo apt install compizconfig-settings-manager

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