m1k1o commented on PR #735:
URL: https://github.com/apache/guacamole-client/pull/735#issuecomment-1158066466
@mike-jumper the problem we are trying to solve are different key codes with
and without `SHIFT` modifier.
Lets say we have `1` key that sends code `x` when no modifier is pressed and
`y` when `SHIFT` is pressed. Under normal circumstances it would be like:
1. Press `SHIFT`
2. Press `1` -> sends keydown `x`.
3. Release `1` -> sends keyup `x`.
4. Release `SHIFT`
But when we do it in a different order, there is a race condition. There are
two posibilities:
1. Press `SHIFT`
2. Press `1` -> sends keydown `x`.
3. Release `SHIFT`
4. Release `1` -> sends keyup `x`.
This is expected behavior, however when doing this relatively slowly we can
end up with following state:
1. Press `SHIFT`
2. Press `1` -> sends keydown `x`.
3. Release `SHIFT`
4. Release `1` -> sends keydown + keyup `y`.
This means, that there is no sent keyup for `x`.
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