CPVM: if special key is pressed down while window is closed, key is not release for next opening

[borisstoyanov]

ISSUE TYPE

• Bug Report

COMPONENT NAME

CPVM, noVNC 

CLOUDSTACK VERSION

4.19

CONFIGURATION

This has been reproduced with VMware, but it might be related to other hypervisors.

SUMMARY

Let's say someone hit's the 'Shift.Down' button in the session window, starts typing in upper case then close the window without depressing in the 'Shift.Down' button, upon next opening of the same session the button is displayed depressed but console still types with up case characters.

STEPS TO REPRODUCE

1. Open CP session to a guest VM
2. Press the 'Shift.Down' special key buttons on the side of the window (any other special key also ) 
3. Start typing and close the CP window
4. Open the same session again from Cloudstack
5. Observe that the button is displayed a depressed as default, but console still produces upper case characters. 

EXPECTED RESULTS

Special keys should be reverted to default and it should type lower case in this scenario 

ACTUAL RESULTS

upper case characters printer while key is depressed. 

[vishesh92]

I could reproduce the issue with vmware in Chromium browser. This bug doesn't occur in Firefox.
Not able to reproduce it for KVM.
Created a PR here: #10743 to reset the modifier keys when connection is created with the VM.