E.g. https://www.pling.com/p/2014917/ (This one doesn't seem to draw buttons entirely properly on xfwm4 either, so I'm not sure if the theme has an issue, or xfwm4 does too. Xfwm4 draws it better than Xfwl4 does, though...) - [x] Some themes have incorrect color bands in some images (e.g. Greybird from xfwm4-theme-generator). - [x] Hg42TabCorner top-left corner "overhang" is clipped at the y-coord of the content area. - [ ] When `frame_opacity` is set to something non-opaque, Hg42TabCorner shows double-opacity sections where there is overlap between decoration pieces. (Only way to really solve this is to pre-composite all decorations into a single texture and render element, which uses more RAM per window.)