Don't let keypress pass through if it is not defined in the layer

[arabshapt]

I would block, keys that are not defined while leaderkey is active. Or make it configurable(true/false)

[saml-dev]

The way the recursive binder spoon works is it registers global keyboard shortcuts with macos. This is generally more reliable than listening to every keystroke globally, because MacOS will sometimes shut off those listeners without warning. For example, lets assume this config:

leader_key = "f18"

a = "..."
b = "..."

[j]
f = "..."

• On startup, register a global keyboard shortcut for f18
• When f18 pressed, register global keyboard shortcuts for a, b, and f
• When j pressed, unregister a, b and j and then register f

So there is some amount of delay between pressing a key and the next layer being ready for pressing, though it should be very short. It's possible computer performance impacts this too, I've tested on an M1 Macbook Air and an M4 Pro Macbook Pro.

Considering the design, we would have to register global shortcuts that do nothing for every key that isn't registered in the current layer. It's possible, but may cause the performance problem mentioned above to be even worse. It could be tested locally by editing the RecursiveBinder spoon though. If I attempted it, I would likely register the negative listeners for any letters and numbers that aren't registered in the current layer (aka not worry about registering a negative for every single key like = or the F keys)