Zoom: line artifact in fogged tiles at top of mapview
S2_6, Gtk3, zoom x2, Amplio2 tileset: there's a zig-zag dark line between the top two visible rows of fogged tiles. If I move the viewport, the line stays at the top of the viewport. It doesn't extend into unfogged tiles.
I see it with Trident too (except of course it's not a zig-zag). I don't see it with Hexemplio. (Which uses client-specific fog drawing, which might be significant.)