Treewalker fixed highlighting consistency

by ccjmne
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https://github.com/aaronik/treewalker.nvim/pull/9

This PR proposes to implement the selection of the outermost ancestor to the jump node that:

  • is valid
  • shares starting coordinates with the jump node

This implementation only bothers with computing the “ideally” selected node when highlighting is activated.

Here’s a screencast of the fixed behaviour in action.

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