ol-man: Set window point not buffer point and wait before search

* lisp/ol-man.el (org-man-open): Set window point not buffer point and
wait before search.  When passed man:path::SEARCH `org-man-open' uses
`search-forward' to jump to the location of e.g. a heading.  Prior to
this fix it only used `search-forward', which will not change the
point of the cursor in the window, meaning that even if there is a
match it will not appear.  Use `accept-process-output' to block until
the manpage finishes rendering before searching the buffer so that
there will be something to find.

lisp/ol-man.el

@@ -43,12 +43,22 @@ If PATH contains extra ::STRING which will use `occur' to search
 matched strings in man buffer."
   (string-match "\\(.*?\\)\\(?:::\\(.*\\)\\)?$" path)
   (let* ((command (match-string 1 path))
-	 (search (match-string 2 path)))
-    (funcall org-man-command command)
+         (search (match-string 2 path))
+         (buffer (funcall org-man-command command)))
     (when search
-      (with-current-buffer (concat "*Man " command "*")
-	(goto-char (point-min))
-	(search-forward search)))))
+      (with-current-buffer buffer
+        (goto-char (point-min))
+        (unless (search-forward search nil t)
+          (let ((process (get-buffer-process buffer)))
+            (while (process-live-p process)
+              (accept-process-output process)))
+          (goto-char (point-min))
+          (search-forward search))
+        (forward-line -1)
+        (let ((point (point)))
+          (let ((window (get-buffer-window buffer)))
+            (set-window-point window point)
+            (set-window-start window point)))))))
 
 (defun org-man-store-link ()
   "Store a link to a README file."