RDCMan - Better multi-monitor support

[i3v]

Both my client and server PCs use Windows 10. On the client side, I got 3 monitors: 1200x1920, 3840x2160, 1200x1920. Note that this results in a non-rectangular total working area (1920 is "centered" inside 2160).

When I connect to a remote PC with the built-in Windows 10 "mstc.exe", I can easily use whole-screen normally. All I need is to set the "Use all my monitors for the remote session" checkbox. The "normally" includes that:

• dual-clicking on the "notepad.exe" window title makes it full-screen on a single particular monitor.
• I never explicitly set the any sizes - they are just determined automatically (and if I disconnect my laptop from the said 3 external monitors "mstc.exe" would automatically use the only built-in monitor)
• it fully supports non-rectangular combination of monitors

However, in RDCman 2.90:

• the largest remote screen setting I that works is 4096x2048 (manually set it in "Server properties -> Remote Desktop Settings -> Remote Desktop Size -> Custom"), which less than a single 4K monitor in height!
• If I set 4096x1920, a part of this area would be invisible, because the top of the 4096x1920 would be aligned with my central monitor's top - any non-rectangular combinations of monitors are problematic
• In some cases scrollbars appear in such a "fullscreen" RDCman window.
• The The maximum size of the remote desktop is determined by the version of the remote desktop activeX control statement in the docs partly explains what's happening, but:
  • It's not that easy to find
  • The most up-to-date Windows version it mentions is Vista. Isn't that a bit outdated?
  • I know that "mstc.exe" works OK with the same server.... Does that mean that normal "mstc.exe" does have this limitation because it does not use that ActiveX control? Maybe that statement should be more explicitly explaining this.
  • Whole 4096x2048 works as a single "monitor", e.g. dual-clicking on the "notepad.exe" window title makes it occupy the whole 4096x2048.
  • The "Use multiple monitors when necessary" checkbox label is misleading. I'd say it should be replaced with "Full-screen Remote Desktop view can span multiple local monitors (see limitations here)". The same "limitations" link is worth to be added to where "Remote Desktop size" is configured.

It's a pity that RDCman is effectively unable to normally work with 4K monitors and multi-monitor setups. It would be nice if you make it on par with "mstc.exe" because in many other aspects it is more convenient (e.g. in managing multiple remote systems).

[Platzer]

In addition it would be awsome to be able to select the monitors as described in: https://www.hanselman.com/blog/how-to-remote-desktop-fullscreen-rdp-with-just-some-of-your-multiple-monitors

I tried to use 2 monitors out of 3 for RDP Connection to the same server via RDCMan but failed.