Description of problem:
We are using xfreerdp as this has clipboard support but every users has intermittent problems with ctrl, alt and super keys getting stuck down in the rdp session. The worst is ctrl seems to get stuck down but only in office applications requiring a complete log out. Every user has experienced these issues.

We have been testing xfreerdp with the following commands:
xfreerdp -0 -u username -d au -g 1678x980 -K -D --plugin cliprdr <IP_ADDRESS>
xfreerdp -0 -u username -d au -g 1678x980 -K --plugin cliprdr <IP_ADDRESS>
xfreerdp -0 -u username -d au -g 1678x980 --plugin cliprdr <IP_ADDRESS>

All three seem to have issues with keys getting stuck down. The worst case is when using ctrl alt up or ctrl alt down to change workspaces ctrl, alt or both tend to get stuck down in the rdp session and need to be pressed multiple times to clears them. Some times they can't be cleared without closing the session.


Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux 7
freerdp-1.0.2-10.el7.x86_64

How reproducible:
At least once per day, ctrl and alt often get stuck when switching between virtual desktops

Steps to Reproduce:
1. I had a xfreerdp session open using the following command:
# xfreerdp -u username -d au --from-stdin -D -g 1910x1120 -K --plugin cliprdr --plugin rdpsnd <hostname>

The rdp session had been open for some time and the rdp screen had locked which happens after about 10 minutes. I hit enter at the password screen and instead of entering the password it caused the rdp session to go full screen. I moved the mouse off the rdp session and back on and hit enter again to cause the session to leave full screen mode. I then tapped ctrl and alt a few times, moved the mouse back onto the rdp session and hit enter which caused it to log in as I would have expected. This is a typical example that all users get of the ctrl or alt keys getting stuck down when moving to a different workspace and moving back again.


Actual results:
I usually have to do the following:
1. Set the windows machine to lock after a couple of minutes.
2. Change to a different workspace so the rdp session is no longer visible
3. Change back after it has locked
4. Try to unlock it. 

It will invariably act as though alt is stuck down so hitting enter on the password entry will cause the rdp session to go full screen instead of unlocking the session. This happens almost every time. This can be cleared by hitting the ctrl and alt keys a few times then trying again.

The other issue we are having is that sometimes the ctrl and alt keys won't unstick for some office applications. People have had to log out and log back in to the windows session to get it them to unstick. I originally thought it was an issue with the application as while it is happening it doesnt affect some applications like notepad but is seems to be specific to xfreerdp, does not happen with rdesktop or spice. This happens less frequently, maybe once per day or less.


Expected results:
No keys getting stuck down or show undesired behaviour.

Additional info:
We once suspected the issue to be below from upstream.

REQ: Switch to from guest desktop to host desktop without moving the mouse #931
https://github.com/FreeRDP/FreeRDP/issues/931

More discussion is here.
Release keyboard grab with Ctrl-Alt #49
https://github.com/FreeRDP/FreeRDP-old/issues/49

But it doesn't seem to be the same thing we are experiencing. We aren't getting stuck in the remote desktop and that page seems to mainly be around releasing the keyboard when in fullscreen mode.

I normally run the remote desktop session in a window and to change focus to my host desktop I just move my mouse off the edge of the remote desktop session. 

The issue we are experiencing is when we return to the remote desktop session and go to type a password. The password enters without any problems but when we hit enter instead of logging in, the desktop session switches to full screen mode as if the ctrl or alt keys are stuck down. To change it back I normally have to move my mouse outside of the rdp window, move it back in, press enter again (to leave fullscreen mode) then tap ctrl and alt to unstick them then hit enter again to log in. This happens almost every time we switch to a different workspace from where the rdp session is and switch back, so multiple times per day.

Some times it is worse when some applications, particularly anything Microsoft Office related, interprets keystrokes as if the windows key is stuck down. The only way to correct this is to log off and log back on. This issue doesn't happen from a Microsoft terminal server session or from the console (either physical or via spice on a kvm VM). This issue happens very rarely.