ctrl-key sticks in noVNC

[ericfranz]

https://discourse.osc.edu/t/rstudio-ctrl-key-sticking/1054 reports ctrl-key sticking after trying to ctrl-tab out of the interactive session window and ctrl key sticks and then any inputs in the window are interpreted as ctrl-input

I think this may be a problem more easily reproduced on Windows since on OS X "command" is used to switch windows and "ctrl" for other uses.

┆Issue is synchronized with this Asana task by Unito

[KinanAlAttar]

I couldn't reproduce the bug.