Scope window-width lexically and do not check for candidate type

helm-org-ql.el

@@ -177,14 +177,13 @@ Is transformed into this query:
 (cl-defun helm-org-ql-source (buffers-files &key (name "helm-org-ql"))
   "Return Helm source named NAME that searches BUFFERS-FILES with `helm-org-ql'."
   ;; Expansion of `helm-build-sync-source' macro.
-  (helm-make-source name 'helm-source-sync
-    :filtered-candidate-transformer (lambda (candidates _)
   (let ((window-width (window-width (helm-window))))
-                                        (mapcar (lambda (marker)
+    (helm-make-source name 'helm-source-sync
-                                                  (unless (markerp marker) (user-error "Unexpected candidate for `helm-org-ql-source'"))
+      :filtered-candidate-transformer (lambda (candidate-markers _)
-                                                  (org-with-point-at marker
+                                        (mapcar (lambda (candidate-marker)
+                                                  (org-with-point-at candidate-marker
                                                     (helm-org-ql--heading window-width)))
-                                                candidates)))
+                                                candidate-markers))
       :candidates (lambda ()
                     (let* ((query (org-ql--query-string-to-sexp helm-pattern)))
                       (when query
@@ -200,7 +199,7 @@ Is transformed into this query:
       :nohighlight t
       :match-dynamic t
       :keymap helm-org-ql-map
-    :action helm-org-ql-actions))
+      :action helm-org-ql-actions)))
 
 (defun helm-org-ql--heading (window-width)
   "Return string for Helm for heading at point.