Improve pygn-mode--true-node-first-position and pygn-mode--true-node-last-position

dwcoates / pygn-mode

An Emacs major-mode for chess PGN files, powered by Python

BSD 2-Clause "Simplified" License

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Closed rolandwalker closed 2 years ago

rolandwalker commented 3 years ago

And implicitly improve pygn-mode--true-node-before-position and pygn-mode--true-node-after-position.

for efficiency, avoid save-excursion unless the position returned would be in whitespace
compare opaque nodes with tsc-node-eq instead of eq. Lisp eq would always return nil, even for trivially identical
```
(eq (tsc-root-node tree-sitter-tree) (tsc-root-node tree-sitter-tree))
```