Fix fast tag selection menu alignment

* lisp/org.el (org-fast-tag-selection): Avoid lines with just
a closing delimiter.  Also correctly align grouped and ungrouped tags.

lisp/org.el

@@ -14614,13 +14614,14 @@ Returns the new tags string, or nil to not change the current settings."
 	  			   ((member tg inherited) i-face))))
 	  (when (equal (caar tbl) :grouptags)
 	    (org-add-props tg nil 'face 'org-tag-group))
-	  (when (and (zerop cnt) (not ingroup) (not intaggroup)) (insert " "))
+	  (when (and (zerop cnt) (not ingroup) (not intaggroup)) (insert "  "))
 	  (insert "[" c "] " tg (make-string
 				 (- fwidth 4 (length tg)) ?\ ))
 	  (push (cons tg c) ntable)
 	  (when (= (cl-incf cnt) ncol)
-	    (insert "\n")
-	    (when (or ingroup intaggroup) (insert " "))
+	    (unless (memq (caar tbl) '(:endgroup :endgrouptag))
+	      (insert "\n")
+	      (when (or ingroup intaggroup) (insert "  ")))
 	    (setq cnt 0)))))
       (setq ntable (nreverse ntable))
       (insert "\n")