fix scroll bindings

src/compile/render-dom/wrappers/Window.ts

@@ -146,9 +146,9 @@ export default class WindowWrapper extends Wrapper {
 					${scrolling} = true;
 					clearTimeout(${scrolling_timeout});
 					window.scrollTo(${
-						bindings.scrollX ? `current["${bindings.scrollX}"]` : `window.pageXOffset`
+						bindings.scrollX ? `ctx.${bindings.scrollX}` : `window.pageXOffset`
 					}, ${
-						bindings.scrollY ? `current["${bindings.scrollY}"]` : `window.pageYOffset`
+						bindings.scrollY ? `ctx.${bindings.scrollY}` : `window.pageYOffset`
 					});
 					${scrolling_timeout} = setTimeout(${clear_scrolling}, 100);
 				}

test/js/samples/window-binding-scroll/expected.js

@@ -29,7 +29,7 @@ function create_fragment($$, ctx) {
 			if (changed.y && !scrolling) {
 				scrolling = true;
 				clearTimeout(scrolling_timeout);
-				window.scrollTo(window.pageXOffset, current["y"]);
+				window.scrollTo(window.pageXOffset, ctx.y);
 				scrolling_timeout = setTimeout(clear_scrolling, 100);
 			}