Greg Spencer b78f92a7c5 Track lock key down state instead of lock state (flutter/engine#20836)
This converts the GTK keyboard code to track the key down states of the lock modifiers NumLock and CapsLock so that they represent the actual "down" state of the key, rather than the lock state itself.

GTK tracks the lock state, and Flutter expects the down state.
2020-09-13 14:44:25 -07:00
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