The PainInTheGlass Mod should really be included in vanilla Minecraft. It seems like one of those overlooked things in the programming. Have you ever wanted to build glass windows a little more intricately than a standard square shape? Have you tried and ended up with gaps in some of the edges? This mod fixes that and you’ll wonder what you’d do without it.
The mod works by simply filling in the gaps left when placing glass panes next to a set of stairs. It’s such a subtle fix but it’s so worth it if you are particular about your constructions and want seamless windows.