"Fun" with multiple displays

It's been a long while since I used multiple monitors with MATE, but pretty sure 16.04 (with Marco/Compiz 0.9) listed all the windows on the current workspace (including secondary monitor).

I think simply, MATE isn't designed in mind for this use case in mind. It works okay if you have a primary display and not fussed for panels on secondary displays.

With multiple monitors in general, I've come across like windows flying about on connection changes or dialogues opening on the wrong screen - but these are likely the window manager's responsibility.

I did some digging to see what issues are outstanding:

Problem with panels when using multiple monitors

https://bugs.launchpad.net/ubuntu/+source/mate-panel/+bug/1714211

I think the best bet is to raise this "clone/duplicate panels across multiple monitors" feature like how Windows 10 does it upstream on their GitHub.