Michael Jumper commented on GUACAMOLE-517:

Can we send the PrintScreen keydown and keyup event to remote desktop on keyup 
event only in scenario of PrintScreen key.

No, this is not a safe change. The keydown event is not reaching the browser 
because it is being handled locally by the OS. Doing what you describe would 
result in the keypress being handled both remotely *and* locally.

> Print screen key definition missing from RDP base keymap
> --------------------------------------------------------
>                 Key: GUACAMOLE-517
>                 URL: https://issues.apache.org/jira/browse/GUACAMOLE-517
>             Project: Guacamole
>          Issue Type: Bug
>          Components: RDP
>    Affects Versions: 0.9.14
>            Reporter: Amarjeet Singh
>            Priority: Trivial
> The scancode mapping for the "Print Screen" key is missing from the base 
> keymap used by Guacamole's RDP support. This means that although Guacamole 
> and usages of guacamole-common-js should correctly map the "Print Screen" key 
> to its corresponding keysym (assuming the key is not intercepted by the OS), 
> that keysym will not be transformed into the scancode required by RDP.
> The necessary mapping needs to be added such that the correct scancode and 
> flags are sent to the RDP server if the "Print Screen" keysym is received.

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