Merge branch 'master' into banner-mask-fix-3

Without this fix, the banner pattern preview generation does not mask
the banner pattern, so the alpha channel of the banner pattern is not
taken into account. This lead to preview banners with color gradients
showing up as a solid color banner and opaque pixel artifacts for the
bottom triangle pattern.

mods/ITEMS/mcl_banners/init.lua

@@ -387,13 +387,15 @@ for colorid, colortab in pairs(mcl_banners.colors) do
 		-- redraw the pattern textures as low-resolution pixel
 		-- art and use that instead.
 
-		local layer = "(([combine:20x40:-2,-2="..pattern.."^[resize:16x24^[colorize:"..color..":"..layer_ratio.."))"
+		local layer = "(([combine:20x40:-2,-2=" .. pattern .. "^[resize:16x24^[colorize:" .. color .. ":" .. layer_ratio .. "))"
+		local mask = "(([combine:20x40:-2,-2=" .. pattern .. "^[resize:16x24" .. "))"
 
 		function escape(text)
 			 return text:gsub("%^", "\\%^"):gsub(":", "\\:") -- :gsub("%(", "\\%("):gsub("%)", "\\%)")
 		end
 
-		finished_banner = "[combine:32x32:0,0=" .. escape(base) .. ":8,4=" .. escape(layer)
+		local layer_masked = layer .. "^[mask:" .. escape(mask)
+		finished_banner = "[combine:32x32:0,0=" .. escape(base) .. ":8,4=" .. escape(layer_masked)
 	end
 
 	inv = finished_banner