If you want to have a look at how Plasma handles Wayland these days you should try KDE neon, it always has the latest Plasma version unlike Kubuntu, so you may have better luck there. I've been daily driving Plasma Wayland on Arch for a few weeks now (currently at version 5.22.3), works well enough, although I still need to switch back to X11 if I feel like gaming thanks to the blasted Nvidia Optimus switchable graphics crap, with Intel graphics only it's great.
Can't comment on multiple monitors since I don't use them.
Sorry to ressurect an old post, but I'm trying do same thing. Came across Display Fusion which allows you to create multiple monitors but also with one monitor you can create functions which allow you to keep a single monitor and rearrange apps how you want. For me I like to have my monitor split in 3 and it seems to work ok. However, this is fine on my personal computer but not on my works one. Looking to do same with a portable app so I don't have to install anything.
I just realized I should have chosen a better question.
"Before trying to compile and run any of the toolkits below, keep in mind that they're all in progress and at most at the prototype stage. While the Wayland core protocol has been stable for some time, experimental protocols extensions are still changing." - https://wayland.freedesktop.org/toolkits.html
In regards to QT5, GTK+, Clutter, SDL and EFL.
> IRC channel: #wayland - https://freenode.net/kb/answer/chat
Better refer to the channel on OFTC. Please see <https://wayland.freedesktop.org/>
June 2020:
> … mostly people asking questions about wayland and not getting answers, …
Is that still true?
I'm a newcomer, things seem quite alive, I glanced at a few posts, most did have answers that appear to be useful.