[tor-bugs] #21426 [Applications/Tor Browser]: Make sure keyup events don't leak underlying keyboard layout

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#21426: Make sure keyup events don't leak underlying keyboard layout
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  enhancement               |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-fingerprinting
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Sometimes if one is not paying attention to lift the key pressed earlier
 than the modifier key first it happens that the `keyup` event is leaking
 the key that would have been pressed without the modifier in the first
 place. See the `ß` in #21390. We should make sure that the `keyup` event
 is delivering the same key as in the `keypress` event.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21426>
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