org-element: Fix visible-only parsing

* lisp/org-element.el (org-element--parse-elements): Also parse
  visible headlines within an otherwise compacted headline.
* testing/lisp/test-org-element.el: Add test.

lisp/org-element.el

@@ -4199,6 +4199,10 @@ elements.
 Elements are accumulated into ACC."
   (save-excursion
     (goto-char beg)
+    ;; Visible only: skip invisible parts at the beginning of the
+    ;; element.
+    (when (and visible-only (org-invisible-p2))
+      (goto-char (min (1+ (org-find-visible)) end)))
     ;; When parsing only headlines, skip any text before first one.
     (when (and (eq granularity 'headline) (not (org-at-heading-p)))
       (org-with-limited-levels (outline-next-heading)))
@@ -4211,12 +4215,13 @@ Elements are accumulated into ACC."
 	     (type (org-element-type element))
 	     (cbeg (org-element-property :contents-begin element)))
 	(goto-char (org-element-property :end element))
+	;; Visible only: skip invisible parts between siblings.
+	(when (and visible-only (org-invisible-p2))
+	  (goto-char (min (1+ (org-find-visible)) end)))
 	;; Fill ELEMENT contents by side-effect.
 	(cond
-	 ;; If VISIBLE-ONLY is true and element is hidden or if it has
-	 ;; no contents, don't modify it.
-	 ((or (and visible-only (org-element-property :hiddenp element))
-	      (not cbeg)))
+	 ;; If element has no contents, don't modify it.
+	 ((not cbeg))
 	 ;; Greater element: parse it between `contents-begin' and
 	 ;; `contents-end'.  Make sure GRANULARITY allows the
 	 ;; recursion, or ELEMENT is a headline, in which case going

testing/lisp/test-org-element.el

@@ -2612,6 +2612,20 @@ Paragraph \\alpha."
     (should (stringp (org-element-property :title (org-element-at-point))))))
 
 
+
+;;; Test Visible Only Parsing
+
+(ert-deftest test-org-element/parse-buffer-visible ()
+  "Test `org-element-parse-buffer' with visible only argument."
+  (should
+   (equal '("H1" "H3" "H5")
+      (org-test-with-temp-text
+	  "* H1\n** H2\n** H3 :visible:\n** H4\n** H5 :visible:"
+	(org-occur ":visible:")
+	(org-element-map (org-element-parse-buffer nil t) 'headline
+	  (lambda (hl) (org-element-property :raw-value hl)))))))
+
+
 
 ;;; Test `:parent' Property