ungrab_keyboard(+Displayable, +Time)

Release the keyboard and any queued events if this client has it actively grabbed, unless the Time specified is earlier that the last-keyboard-grab time or later than the current server time. It also generates focus_in and focus_out events.

Displayable is the ProXL Displayable. If omitted, the default Display is used.

Time is a timestamp in milliseconds (from an event) or current_time. If omitted, current_time is used.