bug#60301: 29.0.60; Tree sitter fontify region over a range with no children issue

[Wilhelm H Kirschbaum]

Currently when there are no children in a range when calling
treesit--children-covering-range-recurse it will return a node, 
but
treesit-font-lock-fontify-region expects a list. This happens when 
there
is a chunk of an embedded language within the range.

Something like this fixes the issue for me:

@@ -859,7 +871,10 @@ treesit--children-covering-range-recurse
        (push child result))
      (setq child (treesit-node-next-sibling child)))
    ;; If NODE has no child, keep NODE.
-    (or result node)))
+
+    ;; Either we have to force a list here or handle
+    ;; the result as either a list or NODE.
+    (or result (list node))))


Wilhelm