fullHelp method
Returns bindings for the full help view, grouped by columns.
Each inner list represents a column of help items.
Implementation
@override
List<List<KeyBinding>> fullHelp() => [
[characterForward, characterBackward, wordForward, wordBackward],
[lineStart, lineEnd],
[
deleteCharacterBackward,
deleteCharacterForward,
deleteWordBackward,
deleteWordForward,
],
[deleteBeforeCursor, deleteAfterCursor],
[paste, copy, acceptSuggestion, nextSuggestion, prevSuggestion],
];