pub fn preemption(mode: Mode, key: &Key) -> Option<Preemption>Expand description
Does dispatch answer (mode, key) before the binding table is consulted?
The single statement of the rule. Keymap::dispatch reads it to
answer keys; anything auditing whether a DECLARATION could ever fire reads
it to say so. Before it existed the rule lived in three inline if mode ==
blocks inside dispatch, visible to nothing else, so a binding for a bare
printable character in Insert mode parsed, applied, reported as applied —
and was dead on arrival with nowhere to learn that from.
Total over the preempting cases; everything else falls through to None,
which is the safe direction (a key wrongly called reachable shows up as a
binding that does not work, a key wrongly called dead hides a working one).