Scroll immediately to bottom when scrollOnUserInput is enabled

See microsoft/vscode#211199

src/browser/Viewport.ts

@@ -108,7 +108,7 @@ export class Viewport extends Disposable {
   }
 
   public scrollToLine(line: number, disableSmoothScroll?: boolean): void {
-    if (!disableSmoothScroll) {
+    if (disableSmoothScroll) {
       this._latestYDisp = line;
     }
     this._scrollableElement.setScrollPosition({