Fix an issue when searching subtree backward (bug#67117)

* src/treesit.c (treesit_traverse_child_helper):
Do not call treesit_traverse_sibling_helper when the named node is
required and the last child is the named node.
Otherwise treesit_traverse_sibling_helper will move cursor to the
previous sibling and last node will be skipped.
* test/src/treesit-tests.el (treesit-search-subtree-forward-1):
(treesit-search-subtree-backward-1):
Add tests.

1 files changed, 30 insertions, 0 deletions

diff --git a/test/src/treesit-tests.el b/test/src/treesit-tests.el
index 69db37fc0b4..9ba3a9340c1 100644
--- a/test/src/treesit-tests.el
+++ b/test/src/treesit-tests.el
@@ -1083,6 +1083,36 @@ This tests bug#60355."
      treesit--ert-defun-navigation-python-program
      treesit--ert-defun-navigation-top-level-master)))
 
+(ert-deftest treesit-search-subtree-forward-1 ()
+  "Test search subtree forward."
+  (skip-unless (treesit-language-available-p 'python))
+  (require 'python)
+  (python-ts-mode)
+  (insert "Temp(1, 2)")
+  (goto-char (point-min))
+  (let ((node (treesit-search-subtree
+               (treesit--thing-at (point) "call")
+               (lambda (n) (equal (treesit-node-type n ) "integer")))))
+
+    (should node)
+    (should (equal (treesit-node-text node) "1"))))
+
+(ert-deftest treesit-search-subtree-backward-1 ()
+  "Test search subtree with backward=t."
+  (skip-unless (treesit-language-available-p 'python))
+  (require 'python)
+  (python-ts-mode)
+  (insert "Temp(1, 2)")
+  (goto-char (point-min))
+  (let ((node (treesit-search-subtree
+               (treesit--thing-at (point) "call")
+               (lambda (n) (equal (treesit-node-type n ) "integer"))
+               t)))
+
+    (should node)
+    (should (equal (treesit-node-text node) "2"))))
+
+
 ;; TODO
 ;; - Functions in treesit.el
 ;; - treesit-load-name-override-list