Add treesit-thing-settings to yaml-ts-mode and enable transpose-sexps

* lisp/treesit.el (treesit-major-mode-setup): Move setting of
'transpose-sexps-function' outside of 'treesit-thing-defined-p'
since 'treesit-transpose-sexps' doesn't depend on the 'sexp' thing.

* lisp/textmodes/yaml-ts-mode.el (yaml-ts-mode):
Add 'treesit-thing-settings' with the 'list' thing,
but use it only for list commands, not sexp commands (bug#73404).

lisp/textmodes/yaml-ts-mode.el

@@ -167,7 +167,22 @@ boundaries.  JUSTIFY is passed to `fill-paragraph'."
 
     (setq-local fill-paragraph-function #'yaml-ts-mode--fill-paragraph)
 
-    (treesit-major-mode-setup)))
+    ;; Navigation.
+    (setq-local treesit-thing-settings
+                `((yaml
+                   (list ,(regexp-opt '("block_mapping_pair"
+                                        "flow_sequence"))
+                         'symbols))))
+
+    (treesit-major-mode-setup)
+
+    ;; Use the `list' thing defined above to navigate only lists
+    ;; with `C-M-n', `C-M-p', `C-M-u', `C-M-d', but not sexps
+    ;; with `C-M-f', `C-M-b' neither adapt to 'show-paren-mode'
+    ;; that is problematic in languages without explicit
+    ;; opening/closing nodes.
+    (setq-local forward-sexp-function nil)
+    (setq-local show-paren-data-function 'show-paren--default)))
 
 (derived-mode-add-parents 'yaml-ts-mode '(yaml-mode))
 

lisp/treesit.el

@@ -3593,9 +3593,10 @@ before calling this function."
     (setq-local add-log-current-defun-function
                 #'treesit-add-log-current-defun))
 
+  (setq-local transpose-sexps-function #'treesit-transpose-sexps)
+
   (when (treesit-thing-defined-p 'sexp nil)
-    (setq-local forward-sexp-function #'treesit-forward-sexp)
-    (setq-local transpose-sexps-function #'treesit-transpose-sexps))
+    (setq-local forward-sexp-function #'treesit-forward-sexp))
 
   (when (treesit-thing-defined-p 'list nil)
     (setq-local forward-sexp-function #'treesit-forward-sexp-list)