Fix treesit-node-field-name and friends (bug#66674)

So turns out ts_node_field_name_for_child takes a named node index,
but we were passing it normal index that counts both named and
anonymous nodes.  That's what makes the field name all wrong in
treesit explorer.

* doc/lispref/parsing.texi:
(Accessing Node Information): Update docstring.
* lisp/treesit.el (treesit-node-index): Add some unrelated comment.
(treesit-node-field-name): Get named node index rather than all node
index.
* src/treesit.c (Ftreesit_node_field_name_for_child): Update
docstring, use ts_node_named_child_count.

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/lispref/parsing.texi b/doc/lispref/parsing.texi
index 353585f79c7..34eb2826a21 100644
--- a/doc/lispref/parsing.texi
+++ b/doc/lispref/parsing.texi
@@ -1015,8 +1015,8 @@ This function returns the field name of the @var{n}'th child of
 @var{node}.  It returns @code{nil} if there is no @var{n}'th child, or
 the @var{n}'th child doesn't have a field name.
 
-Note that @var{n} counts both named and anonymous children, and
-@var{n} can be negative, e.g., @minus{}1 represents the last child.
+Note that @var{n} counts named nodes only, and @var{n} can be
+negative, e.g., @minus{}1 represents the last child.
 @end defun
 
 @defun treesit-node-child-count node &optional named