Iron Bars & Glass Panes do not bind/stretch to the edges of the cobblestone walls. Attached is a screen shot of how it looks.
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Duplicate of MC-2938, please use the search function to see if your bug has already been submitted. Currently over 53% of tickets are being closed as duplicate.
Ah, sorry about that. 🙂 I'm still getting the hang of this bug tracking system...

But those screenshots of yours are a very nice example for why they should connect. Please attach them to the MC-2938, too. I hadn't thought about that kind of use. Clever, imho.