Created attachment 163554 [details]
Screenshot illustrating the toolbar I'm referring to

SUMMARY

If krdc is accessing a remote RDP host (a Windows box) in full-screen mode when the local system (running krdc) goes into Screen Lock and Energy Saving simultaneously, when the user logs back into the local system later, krdc will still be accessing the host, but the toolbar at the top of the full-screen window is gone.

There doesn't seem to be any way to get it back short of disconnecting the krdc session from the host side (there's no way to disconnect from the local side that I know of, since you can't access the toolbar).

STEPS TO REPRODUCE (in KDE Neon)
1. systemsettings>Workspace Behavior>Screen Locking>Lock screen automatically after 1 minutes
2. systemsettings>Power Management>Energy Saving>Screen Enterg Saving Switch off after 1 minutes
3. Run krdc, connect to remote Windows host via RDP, go into full-screen mode.
4. Leave local system alone in full-screen mode (no keyboard/mouse action) for 2 minutes
5. Click a keyboard key, log back into system with password

OBSERVED RESULT

Toolbar is gone.

EXPECTED RESULT

Toolbar should still be visible and usable.

SOFTWARE/OS VERSIONS
Windows: 10 x64 (remote session)
Linux/KDE Plasma: 

Linux MONOLITH 6.2.0-37-generic #38~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov  2 18:01:13 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
Distributor ID: Neon
Description:    KDE neon 5.27
Release:        22.04
Codename:       jammy

KDE Plasma Version: 5.27.9
KDE Frameworks Version: 5.111.0
Qt Version:  5.15.11

ADDITIONAL INFORMATION

In attached screenshot, arrow points at the toolbar I'm talking about (I'm not 100% sure that's what it's called).

Problem occurs only when local systems is BOTH in Screen Lock *and* Energy Saving mode simultaneously. Either one alone doesn't cause the problem.