Catch errors due to "Restricted" selection. #2905

src/Posting/QR.coffee

@@ -295,6 +295,7 @@ QR =
     postRange.selectNode root
     text = if post.board.ID is g.BOARD.ID then ">>#{post}\n" else ">>>/#{post.board}/#{post}\n"
     for i in [0...sel.rangeCount]
+      try
         range = sel.getRangeAt i
         # Trim range to be fully inside post
         if range.compareBoundaryPoints(Range.START_TO_START, postRange) < 0