That's one month I'm working on a patch to fix the weston_switch_mode() function in weston, the reference wayland compositor. I didn't spend a month on that piece of code, but a few hours splitted over the last month. I had many discutions on IRC, worked on it, had comments on my patches, and finally the code should land in wayland/weston 1.3. The commits:

• The first one does massive renaming.
• The second one does the job

So now when a RDP client connects on the RDP compositor and its resolution does not match the desktop resolution, it's the desktop that adjust its size and no more the client.