treesitter: update vendored tree-sitter runtime

tree-sitter/tree-sitter commit 6cb8d24de2d99c4c50c9a0fd1e719ca5b3abc87f

Included files are:
lib/include/tree-sitter/*.h
lib/src/*.[ch]
lib/src/unicode/*
LICENSE

1 files changed, 22 insertions, 6 deletions

diff --git a/src/tree_sitter/array.h b/src/tree_sitter/array.h
index bc77e687bf..26cb8448f1 100644
--- a/src/tree_sitter/array.h
+++ b/src/tree_sitter/array.h
@@ -126,12 +126,28 @@ static inline void array__splice(VoidArray *self, size_t element_size,
   array__reserve(self, element_size, new_size);
 
   char *contents = (char *)self->contents;
-  if (self->size > old_end)
-    memmove(contents + new_end * element_size, contents + old_end * element_size,
-            (self->size - old_end) * element_size);
-  if (new_count > 0)
-    memcpy((contents + index * element_size), elements,
-           new_count * element_size);
+  if (self->size > old_end) {
+    memmove(
+      contents + new_end * element_size,
+      contents + old_end * element_size,
+      (self->size - old_end) * element_size
+    );
+  }
+  if (new_count > 0) {
+    if (elements) {
+      memcpy(
+        (contents + index * element_size),
+        elements,
+        new_count * element_size
+      );
+    } else {
+      memset(
+        (contents + index * element_size),
+        0,
+        new_count * element_size
+      );
+    }
+  }
   self->size += new_count - old_count;
 }