Make sure this._latestYDisp is up to date

Author: anthonykim1

src/browser/Viewport.ts

@@ -157,9 +157,10 @@ export class Viewport extends Disposable {
     });
     this._suppressOnScrollHandler = false;
 
-    // If ydisp has been changed by some other copmonent (input/buffer), then stop animating smooth
+    // If ydisp has been changed by some other component (input/buffer), then stop animating smooth
     // scroll and scroll there immediately.
     if (ydisp !== this._latestYDisp) {
+      this._latestYDisp = ydisp;
       this._scrollableElement.setScrollPosition({
         scrollTop: ydisp * this._renderService.dimensions.css.cell.height
       });