`swap` can not swap children across parents

To record a regression I found while refactoring main.

function f1(arg1, arg2)
  ...
end

function f2(arg3, arg4)
  ...
end

Formerly if we call swap_next("@parameter.inner") while the cursor is at arg2, nothing will happen, because there's no next parameter in the same parent node. Now it will swap with arg3 in f2 because it is the next parameter even though they do not have a common parent node.

Currently, it seems not possible to do this because we only record nodes' range, but it should be easily fixed if we complete https://github.com/nvim-treesitter/nvim-treesitter-textobjects/pull/674.

Reproduce the example by calling swap_next("@parameter.inner") at arg2, then read PR #674 and the swap_next entry point to understand the recorded node ranges. Done means parameters are swapped only when they share a parent, so arg2 is not exchanged with arg3 in f2.