fixed CanvasKeyValueIterator loop

src/lib/ui/Canvas.hx

@@ -106,18 +106,22 @@ class CanvasKeyValueIterator {
 			return null;
 		}
 
-		for (y in (this.index.y)...(this.canvas.length)){
+		var startX = this.index.x + 1;
+
+		for (y in this.index.y...this.canvas.length){
 			if (this.canvas[y] == null) {
 				continue;
 			}
 
-			for (x in (this.index.x + 1)...(this.canvas[y].length)){
+			for (x in startX...(this.canvas[y].length)){
 				if (this.canvas[y][x] == null) {
 					continue;
 				}
 
 				return {x: x, y: y};
 			}
+
+			startX = 0;
 		}
 		return null;
 	}