More specifically, we save them and then place the `macro_end` pointer
before them so they are essentially ignored and the other macro may
freely overwrite them.
Right after the user initiates the macro recording, they usually need
to release some keys used to access the DYN_REC_START layers. It makes
sense to ignore them.
Note: The keys used to access the DYN_REC_STOP key are *not* ignored.
From the official docs:
```
Note: The official Debian and Ubuntu images automatically run apt-get clean, so explicit invocation is not required.
```
Also added ` && rm -rf /var/lib/apt/lists/*` as part of the install line which probably does what was intended (no need to make a new layer).
Added apt-get update to the RUN payload, as it should be part of the same layer.
Both are documented here: https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/
Dynamic macro functionality is modified to check for `DYN_REC_STOP`, so
that macro recording can be stopped with a designated key combination
(e.g. `qs` or anything) instead of mandating the use of a `_DYN` layer.
`_DYN` layer stopping can still be done by passing `DYN_REC_STOP` within
`process_record_user()`:
bool process_record_user(uint16_t keycode, keyrecord_t *record) {
uint16_t macro_kc = (keycode == MO(_DYN) ? DYN_REC_STOP : keycode);
if (!process_record_dynamic_macro(macro_kc, record)) {
return false;
}
return true;
}
Empirically, waiting for N consecutive identical scans as a debouncing
strategy doesn't work very well for the ErgoDox EZ where scans are very
slow compared to most keyboards. Instead, debounce the signals by
eagerly reporting a change as soon as one scan observes it, but then
ignoring further changes from that key for the next N scans.
This is implemented by keeping an extra matrix of uint8 countdowns, such
that only keys whose countdown is currently zero are eligible to change.
When we do observe a change, we bump that key's countdown to DEBOUNCE.
During each scan, every nonzero countdown is decremented.
With this approach to debouncing, much higher debounce constants are
tolerable, because latency does not increase with the constant, and
debounce countdowns on one key do not interfere with events on other
keys. The only negative effect of increasing the constant is that the
minimum duration of a keypress increases. Perhaps I'm just extremely
unlucky w.r.t. key switch quality, but I saw occasional bounces even
with DEBOUNCE=10; with 15, I've seen none so far. That's around 47ms,
which seems like an absolutely insane amount of time for a key to be
bouncy, but at least it works.
