Commit ec2915fefc42fa11fb1da036545193cb8e7bc449
2025-01-22T17:18:21
symbols: Fix a possible null pointer deference Introduce a new Expression type, `EXPR_EMPTY_LIST`, to avoid the ambiguity between action and keysym empty lists. Two alternatives were rejected to keep the semantics clear: - Using `EXPR_KEYSYM_LIST`: because we would end up accepting an empty keysym list while processing actions. - Using NULL: convey no info and is hazardous.