I’ve been using the “Always group windows” preference with MATE’s Window List panel applet for years. Recently I’ve noticed that every time I start a new session, that preference no longer applies by default and I need to reset it.
I’ve discovered that the appropriate preference is saved in ~/.config/dconf – in particular, the following snippets exist in the output from dconf dump /
This should not be a problem because the key is created for every window list you add. E.g. when you add 100 window-lists hundred of keys have to be created