Reset bidi-paragraph-direction on article rendering

* lisp/gnus/gnus-art.el (gnus-request-article-this-buffer): Reset
bidi-paragraph-direction on article rendering.  (Bug#28454)

Copyright-paperwork-exempt: yes

lisp/gnus/gnus-art.el

@@ -6984,6 +6984,7 @@ If given a prefix, show the hidden text instead."
 	(save-excursion
 	  (erase-buffer)
 	  (gnus-kill-all-overlays)
+	  (setq bidi-paragraph-direction nil)
 	  (setq group (or group gnus-newsgroup-name))
 
 	  ;; Using `gnus-request-article' directly will insert the article into
@@ -7091,6 +7092,7 @@ If given a prefix, show the hidden text instead."
 	      (while (not result)
 		(erase-buffer)
 		(gnus-kill-all-overlays)
+		(setq bidi-paragraph-direction nil)
 		(let ((gnus-newsgroup-name group))
 		  (gnus-check-group-server))
 		(cond