add window to WM exceptions

[alphastrata]

I swear there used to be a button for adding a currently open window to the list of windows to exclude from the WM... no?

Is there a guide on how to manually add them? I tried following the RON examples here:
#726.

Is there a way to ask cosmic-comp the right info? i.e

from the default_exemptions in the PR mentioned above (merged).

	// Appid matches
	(appid: "Authy Desktop", titles: [".*"]),
	(appid: "Com.github.amezin.ddterm", titles: [".*"]),

Which I tried to copy +- like this:

[
    (
		appid: ".*", 
		 titles:[
                      "My window... probably?",
                  ]
	),
    (
        appid: "*",
        titles:[
            "My window... probably?",
        ]
    )
]

How does one get from cosmic-comp the appids that are open in the WM currently?, or the titles said app may have windows under?