kc3-lang/libxkbcommon/changes/api/+empty-keysym-action-lists.feature.md

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• Hash : 44480f7c
  Author :
  Date : 2025-04-01T08:28:02
  

  xkbcomp: Enable lists of keysyms and actions {} and {a}
  
  Motivations:
  - Follow the principle of least astonishment;
  - Ensure consistency;
  - Enhance the use of custom defaults;
  - Facilitate the tests.
  
  There is some ambiguity because we use `{}` to denote both an empty list of
  keysyms and an empty list of actions. But as soon as we get a keysym or an
  action, we know whether it is a `MultiKeySymList` or a `MultiActionList`.
  So we just count the `{}` at the *beginning* using `NoSymbolOrActionList`,
  then replace it by the relevant count of `NoSymbol` or `NoAction()` once the
  ambiguity is solved. If not, this is a list of empties of *some* type: we
  drop those empties and delegate the type resolution using `ExprEmptyList()`.
  

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• changes/api/+empty-keysym-action-lists.feature.md

• Added support for actions and keysyms level list of length 0 and 1: respectively
  `{}` and `{a}`. Example: `key <A> { [{}, {a}, {a, A}] };`.
  

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