Splice list in a nested block list fails!

[jonasfj]

SLICE LIST IN NESTED BLOCK LIST
---
key:
- true
- - false
---
- [splice, [key, 1], 0, 1, ['test']]

Just:

• Create test/testdata/input/splicelist_in_nested_block_list.test with the contents above.
• Run dart test test/golden_test.dart

This fails, and it shouldn't.

We should fix this.

[jonasfj]

note @kekavc24 has suggestions for how to fix this in dart-archive/yaml_edit#80 (comment)