Reminder: reason for rare stuck-key problem identified

[floooh]

The problem are shift-combinations like here:

https://github.com/floooh/chips-test/blob/f63750b9195e0bc2cc7ba01eccadce00d7e55680/examples/sokol/kc85.c#L252

If the keydown happened with shift, and the keyup without shift (or vice versa), then the key will get stuck. Especially with the Spacebar this can happen accidentially when the next character requires the shift key.

[floooh]

Fixed in:

• [x] kc85
• [x] cpc
• [ ] c64